diff --git a/dist/cjs/device/Device.js b/dist/cjs/device/Device.js
index aec0758..486c70c 100644
--- a/dist/cjs/device/Device.js
+++ b/dist/cjs/device/Device.js
@@ -181,6 +181,7 @@ class Device extends events_1.EventEmitter {
             instance,
             payloadVersion: event.payloadVersion ?? capability.descriptor.version,
             payload: checked,
+            emptyContext: event.emptyContext,
         });
         const bytes = Buffer.byteLength(JSON.stringify(message));
         if (bytes > topics.EVENT_BYTES)
diff --git a/dist/cjs/messages/build.js b/dist/cjs/messages/build.js
index 161e227..6689aee 100644
--- a/dist/cjs/messages/build.js
+++ b/dist/cjs/messages/build.js
@@ -113,7 +113,11 @@ function sceneEvent(fields) {
         context: {},
     };
 }
-/** An event a device raises by itself, of any interface. The header has no correlationToken: nobody asked. */
+/**
+ * An event a device raises by itself, of any interface. The header has no correlationToken: nobody asked. The
+ * pages differ on the context, so the caller says which it is: DoorbellPress is printed with an empty one
+ * (alexa-doorbelleventsource.html), the Event of Alexa.SimpleEventSource without.
+ */
 function proactiveEvent(fields) {
     const { namespace, name, instance, messageId, payloadVersion, payload } = fields;
     return {
@@ -122,13 +126,16 @@ function proactiveEvent(fields) {
             endpoint: { endpointId: fields.endpointId },
             payload,
         },
+        ...(fields.emptyContext ? { context: {} } : {}),
     };
 }
 /** Somebody rang (alexa-doorbelleventsource.html). */
 function doorbellPress(fields) {
     const { endpointId, messageId } = fields;
     const payload = { cause: { type: fields.cause ?? "PHYSICAL_INTERACTION" }, timestamp: (0, property_js_1.isoTime)(fields.timestamp) };
-    return proactiveEvent({ endpointId, messageId, namespace: "Alexa.DoorbellEventSource", name: "DoorbellPress", payload });
+    return proactiveEvent({
+        endpointId, messageId, namespace: "Alexa.DoorbellEventSource", name: "DoorbellPress", payload, emptyContext: true,
+    });
 }
 /** An event of a button or a sensor that routines start on (alexa-simpleeventsource.html). */
 function simpleEvent(fields) {
diff --git a/dist/cjs/registry/interfaces/DoorbellEventSource.js b/dist/cjs/registry/interfaces/DoorbellEventSource.js
index 661f6e9..d339bc8 100644
--- a/dist/cjs/registry/interfaces/DoorbellEventSource.js
+++ b/dist/cjs/registry/interfaces/DoorbellEventSource.js
@@ -18,7 +18,7 @@ exports.DoorbellEventSource = (0, types_js_1.defineInterface)({
     properties: {},
     directives: {},
     events: {
-        DoorbellPress: { name: "DoorbellPress", payload: (0, events_js_1.happened)("PHYSICAL_INTERACTION"), topic: "proactive" },
+        DoorbellPress: { name: "DoorbellPress", payload: (0, events_js_1.happened)("PHYSICAL_INTERACTION"), topic: "proactive", emptyContext: true },
     },
     // The capability is the announcement that the endpoint raises the event: proactivelyReported whatever was declared
     discovery: () => ({ properties: false, topLevel: { proactivelyReported: true } }),
diff --git a/dist/esm/device/Device.js b/dist/esm/device/Device.js
index 14f11e3..1a49bbd 100644
--- a/dist/esm/device/Device.js
+++ b/dist/esm/device/Device.js
@@ -146,6 +146,7 @@ class Device extends EventEmitter {
             instance,
             payloadVersion: event.payloadVersion ?? capability.descriptor.version,
             payload: checked,
+            emptyContext: event.emptyContext,
         });
         const bytes = Buffer.byteLength(JSON.stringify(message));
         if (bytes > topics.EVENT_BYTES)
diff --git a/dist/esm/messages/build.d.ts b/dist/esm/messages/build.d.ts
index bf44eff..5f327e5 100644
--- a/dist/esm/messages/build.d.ts
+++ b/dist/esm/messages/build.d.ts
@@ -88,8 +88,14 @@ export interface ProactiveEventFields extends Envelope {
     /** Default: "3". */
     payloadVersion?: string;
     payload: Record<string, unknown>;
+    /** true: the message has "context": {}, as the page of the event prints it. Default: no context. */
+    emptyContext?: boolean;
 }
-/** An event a device raises by itself, of any interface. The header has no correlationToken: nobody asked. */
+/**
+ * An event a device raises by itself, of any interface. The header has no correlationToken: nobody asked. The
+ * pages differ on the context, so the caller says which it is: DoorbellPress is printed with an empty one
+ * (alexa-doorbelleventsource.html), the Event of Alexa.SimpleEventSource without.
+ */
 export declare function proactiveEvent(fields: ProactiveEventFields): ProactiveEventMessage;
 export interface DoorbellPressFields extends Envelope {
     /** Default: "PHYSICAL_INTERACTION", somebody pressed the button. */
diff --git a/dist/esm/messages/build.js b/dist/esm/messages/build.js
index 9159b1d..65527b8 100644
--- a/dist/esm/messages/build.js
+++ b/dist/esm/messages/build.js
@@ -99,7 +99,11 @@ export function sceneEvent(fields) {
         context: {},
     };
 }
-/** An event a device raises by itself, of any interface. The header has no correlationToken: nobody asked. */
+/**
+ * An event a device raises by itself, of any interface. The header has no correlationToken: nobody asked. The
+ * pages differ on the context, so the caller says which it is: DoorbellPress is printed with an empty one
+ * (alexa-doorbelleventsource.html), the Event of Alexa.SimpleEventSource without.
+ */
 export function proactiveEvent(fields) {
     const { namespace, name, instance, messageId, payloadVersion, payload } = fields;
     return {
@@ -108,13 +112,16 @@ export function proactiveEvent(fields) {
             endpoint: { endpointId: fields.endpointId },
             payload,
         },
+        ...(fields.emptyContext ? { context: {} } : {}),
     };
 }
 /** Somebody rang (alexa-doorbelleventsource.html). */
 export function doorbellPress(fields) {
     const { endpointId, messageId } = fields;
     const payload = { cause: { type: fields.cause ?? "PHYSICAL_INTERACTION" }, timestamp: isoTime(fields.timestamp) };
-    return proactiveEvent({ endpointId, messageId, namespace: "Alexa.DoorbellEventSource", name: "DoorbellPress", payload });
+    return proactiveEvent({
+        endpointId, messageId, namespace: "Alexa.DoorbellEventSource", name: "DoorbellPress", payload, emptyContext: true,
+    });
 }
 /** An event of a button or a sensor that routines start on (alexa-simpleeventsource.html). */
 export function simpleEvent(fields) {
diff --git a/dist/esm/messages/types.d.ts b/dist/esm/messages/types.d.ts
index aa644f3..dc4bfb0 100644
--- a/dist/esm/messages/types.d.ts
+++ b/dist/esm/messages/types.d.ts
@@ -73,4 +73,6 @@ export interface SceneEventMessage {
 /** An event a device raises by itself: DoorbellPress, the Event of Alexa.SimpleEventSource. */
 export interface ProactiveEventMessage {
     event: Event;
+    /** Only with an event whose page prints it: DoorbellPress has an empty one, the Event of a button has none. */
+    context?: {};
 }
diff --git a/dist/esm/registry/interfaces/DoorbellEventSource.js b/dist/esm/registry/interfaces/DoorbellEventSource.js
index 20739d8..cb531ad 100644
--- a/dist/esm/registry/interfaces/DoorbellEventSource.js
+++ b/dist/esm/registry/interfaces/DoorbellEventSource.js
@@ -15,7 +15,7 @@ export const DoorbellEventSource = defineInterface({
     properties: {},
     directives: {},
     events: {
-        DoorbellPress: { name: "DoorbellPress", payload: happened("PHYSICAL_INTERACTION"), topic: "proactive" },
+        DoorbellPress: { name: "DoorbellPress", payload: happened("PHYSICAL_INTERACTION"), topic: "proactive", emptyContext: true },
     },
     // The capability is the announcement that the endpoint raises the event: proactivelyReported whatever was declared
     discovery: () => ({ properties: false, topLevel: { proactivelyReported: true } }),
diff --git a/dist/esm/registry/types.d.ts b/dist/esm/registry/types.d.ts
index 2daf117..82aaea2 100644
--- a/dist/esm/registry/types.d.ts
+++ b/dist/esm/registry/types.d.ts
@@ -66,6 +66,8 @@ export interface EventDescriptor {
     payload: Schema<any>;
     /** response: the answer to a directive. proactive: sent without one. */
     topic: "response" | "proactive";
+    /** A proactive event that the page prints with "context": {}, DoorbellPress. Default: sent without a context. */
+    emptyContext?: boolean;
 }
 /** What an interface adds to the capability object in discovery, next to the fields every capability has. */
 export interface CapabilityExtras {
diff --git a/dist/types/messages/build.d.ts b/dist/types/messages/build.d.ts
index bf44eff..5f327e5 100644
--- a/dist/types/messages/build.d.ts
+++ b/dist/types/messages/build.d.ts
@@ -88,8 +88,14 @@ export interface ProactiveEventFields extends Envelope {
     /** Default: "3". */
     payloadVersion?: string;
     payload: Record<string, unknown>;
+    /** true: the message has "context": {}, as the page of the event prints it. Default: no context. */
+    emptyContext?: boolean;
 }
-/** An event a device raises by itself, of any interface. The header has no correlationToken: nobody asked. */
+/**
+ * An event a device raises by itself, of any interface. The header has no correlationToken: nobody asked. The
+ * pages differ on the context, so the caller says which it is: DoorbellPress is printed with an empty one
+ * (alexa-doorbelleventsource.html), the Event of Alexa.SimpleEventSource without.
+ */
 export declare function proactiveEvent(fields: ProactiveEventFields): ProactiveEventMessage;
 export interface DoorbellPressFields extends Envelope {
     /** Default: "PHYSICAL_INTERACTION", somebody pressed the button. */
diff --git a/dist/types/messages/types.d.ts b/dist/types/messages/types.d.ts
index aa644f3..dc4bfb0 100644
--- a/dist/types/messages/types.d.ts
+++ b/dist/types/messages/types.d.ts
@@ -73,4 +73,6 @@ export interface SceneEventMessage {
 /** An event a device raises by itself: DoorbellPress, the Event of Alexa.SimpleEventSource. */
 export interface ProactiveEventMessage {
     event: Event;
+    /** Only with an event whose page prints it: DoorbellPress has an empty one, the Event of a button has none. */
+    context?: {};
 }
diff --git a/dist/types/registry/types.d.ts b/dist/types/registry/types.d.ts
index 2daf117..82aaea2 100644
--- a/dist/types/registry/types.d.ts
+++ b/dist/types/registry/types.d.ts
@@ -66,6 +66,8 @@ export interface EventDescriptor {
     payload: Schema<any>;
     /** response: the answer to a directive. proactive: sent without one. */
     topic: "response" | "proactive";
+    /** A proactive event that the page prints with "context": {}, DoorbellPress. Default: sent without a context. */
+    emptyContext?: boolean;
 }
 /** What an interface adds to the capability object in discovery, next to the fields every capability has. */
 export interface CapabilityExtras {
diff --git a/src/device/Device.ts b/src/device/Device.ts
index b3169cf..24cb789 100644
--- a/src/device/Device.ts
+++ b/src/device/Device.ts
@@ -228,6 +228,7 @@ class Device extends EventEmitter {
       instance,
       payloadVersion: event.payloadVersion ?? capability.descriptor.version,
       payload: checked,
+      emptyContext: event.emptyContext,
     });
     const bytes = Buffer.byteLength(JSON.stringify(message));
     if (bytes > topics.EVENT_BYTES) return refuse(`it is ${bytes} bytes as JSON, Alex2MQTT takes ${topics.EVENT_BYTES}`);
diff --git a/src/messages/build.ts b/src/messages/build.ts
index 1744dc9..2d962e5 100644
--- a/src/messages/build.ts
+++ b/src/messages/build.ts
@@ -182,9 +182,15 @@ export interface ProactiveEventFields extends Envelope {
   /** Default: "3". */
   payloadVersion?: string;
   payload: Record<string, unknown>;
+  /** true: the message has "context": {}, as the page of the event prints it. Default: no context. */
+  emptyContext?: boolean;
 }
 
-/** An event a device raises by itself, of any interface. The header has no correlationToken: nobody asked. */
+/**
+ * An event a device raises by itself, of any interface. The header has no correlationToken: nobody asked. The
+ * pages differ on the context, so the caller says which it is: DoorbellPress is printed with an empty one
+ * (alexa-doorbelleventsource.html), the Event of Alexa.SimpleEventSource without.
+ */
 export function proactiveEvent(fields: ProactiveEventFields): ProactiveEventMessage {
   const { namespace, name, instance, messageId, payloadVersion, payload } = fields;
   return {
@@ -193,6 +199,7 @@ export function proactiveEvent(fields: ProactiveEventFields): ProactiveEventMess
       endpoint: { endpointId: fields.endpointId },
       payload,
     },
+    ...(fields.emptyContext ? { context: {} } : {}),
   };
 }
 
@@ -207,7 +214,9 @@ export interface DoorbellPressFields extends Envelope {
 export function doorbellPress(fields: DoorbellPressFields): ProactiveEventMessage {
   const { endpointId, messageId } = fields;
   const payload = { cause: { type: fields.cause ?? "PHYSICAL_INTERACTION" }, timestamp: isoTime(fields.timestamp) };
-  return proactiveEvent({ endpointId, messageId, namespace: "Alexa.DoorbellEventSource", name: "DoorbellPress", payload });
+  return proactiveEvent({
+    endpointId, messageId, namespace: "Alexa.DoorbellEventSource", name: "DoorbellPress", payload, emptyContext: true,
+  });
 }
 
 export interface SimpleEventFields extends Envelope {
diff --git a/src/messages/types.ts b/src/messages/types.ts
index 173064d..da420f9 100644
--- a/src/messages/types.ts
+++ b/src/messages/types.ts
@@ -70,4 +70,6 @@ export interface SceneEventMessage {
 /** An event a device raises by itself: DoorbellPress, the Event of Alexa.SimpleEventSource. */
 export interface ProactiveEventMessage {
   event: Event;
+  /** Only with an event whose page prints it: DoorbellPress has an empty one, the Event of a button has none. */
+  context?: {};
 }
diff --git a/src/registry/interfaces/DoorbellEventSource.ts b/src/registry/interfaces/DoorbellEventSource.ts
index 461ad96..bace421 100644
--- a/src/registry/interfaces/DoorbellEventSource.ts
+++ b/src/registry/interfaces/DoorbellEventSource.ts
@@ -16,7 +16,7 @@ export const DoorbellEventSource = defineInterface({
   properties: {},
   directives: {},
   events: {
-    DoorbellPress: { name: "DoorbellPress", payload: happened("PHYSICAL_INTERACTION"), topic: "proactive" },
+    DoorbellPress: { name: "DoorbellPress", payload: happened("PHYSICAL_INTERACTION"), topic: "proactive", emptyContext: true },
   },
   // The capability is the announcement that the endpoint raises the event: proactivelyReported whatever was declared
   discovery: () => ({ properties: false, topLevel: { proactivelyReported: true } }),
diff --git a/src/registry/types.ts b/src/registry/types.ts
index 4aa144d..3841f42 100644
--- a/src/registry/types.ts
+++ b/src/registry/types.ts
@@ -61,6 +61,8 @@ export interface EventDescriptor {
   payload: Schema<any>;
   /** response: the answer to a directive. proactive: sent without one. */
   topic: "response" | "proactive";
+  /** A proactive event that the page prints with "context": {}, DoorbellPress. Default: sent without a context. */
+  emptyContext?: boolean;
 }
 
 /** What an interface adds to the capability object in discovery, next to the fields every capability has. */
diff --git a/test/device/raise.test.js b/test/device/raise.test.js
index 239c918..5f17130 100644
--- a/test/device/raise.test.js
+++ b/test/device/raise.test.js
@@ -30,7 +30,8 @@ const refused = (raise, problem) => assert.throws(raise, (err) => err instanceof
 
 test("raise() publishes the event on <root>/event, with the endpoint, a new messageId, the time and the usual cause", async () => {
   const { device, sent } = doorbell();
-  const printed = doc("alexa-doorbelleventsource", "DoorbellPress.event").event;
+  const example = doc("alexa-doorbelleventsource", "DoorbellPress.event");
+  const printed = example.event;
   const before = Date.now();
 
   assert.deepEqual(await device.raise(DoorbellEventSource, "DoorbellPress"), { ok: true, topic: "root/event" });
@@ -39,6 +40,10 @@ test("raise() publishes the event on <root>/event, with the endpoint, a new mess
 
   assert.equal(topics.event("root"), "root/event");
   assert.deepEqual(sent.published.map(({ topic }) => topic), ["root/event", "root/event", "root/event"]);
+  for (const { message } of sent.published) {
+    assert.deepEqual(Object.keys(message).sort(), Object.keys(example).sort());
+    assert.deepEqual(message.context, example.context);
+  }
   const [first, second, third] = sent.published.map(({ message }) => message.event);
   for (const event of [first, second, third]) {
     assert.deepEqual(event.endpoint, { endpointId: "door-1" });
@@ -62,7 +67,8 @@ test("raise() for an instance: the Event of a button has the instance in its hea
   remote.publisher = sent;
   const top = remote.add(SimpleEventSource, button("TopButton", ["SinglePush", "DoublePush"]));
   remote.add(SimpleEventSource, button("BottomButton", ["SinglePush"]));
-  const printed = doc("alexa-simpleeventsource", "Event.event").event;
+  const example = doc("alexa-simpleeventsource", "Event.event");
+  const printed = example.event;
 
   await remote.raise(SimpleEventSource, "Event", printed.payload, { instance: top.instance, messageId: "push-1" });
   assert.deepEqual(sent.published, [{
@@ -76,6 +82,7 @@ test("raise() for an instance: the Event of a button has the instance in its hea
     },
   }]);
   assert.equal(printed.header.payloadVersion, "1.0");
+  assert.deepEqual(Object.keys(sent.published[0].message), Object.keys(example));
 
   const raised = "remote-1: Alexa.SimpleEventSource.Event was not raised: ";
   assert.throws(() => remote.raise(SimpleEventSource, "Event", { id: "Button.SinglePush.1" }), {
@@ -117,7 +124,7 @@ test("raise() refuses an event the device has no capability for, and one that wo
   );
   refused(
     () => device.raise(DoorbellEventSource, "DoorbellPress", { picture: "x".repeat(topics.EVENT_BYTES) }),
-    `${was("Alexa.DoorbellEventSource.DoorbellPress")}it is 16296 bytes as JSON, Alex2MQTT takes 16000`
+    `${was("Alexa.DoorbellEventSource.DoorbellPress")}it is 16309 bytes as JSON, Alex2MQTT takes 16000`
   );
   assert.deepEqual(sent.published, []);
 });
diff --git a/test/messages/build.test.js b/test/messages/build.test.js
index 6207ef0..249b188 100644
--- a/test/messages/build.test.js
+++ b/test/messages/build.test.js
@@ -4,6 +4,7 @@
 const { test } = require("node:test");
 const assert = require("node:assert/strict");
 const { messages, MessageError } = require("alex2node");
+const { doc } = require("../helpers/fixtures.js");
 const { UUID_V4 } = require("../helpers/harness.js");
 
 const AT = "2026-09-28T10:00:00.000Z";
@@ -134,17 +135,21 @@ test("sceneEvent: ActivationStarted and DeactivationStarted with the cause and t
   assert.deepEqual(stopped.event.payload, { cause: { type: "APP_INTERACTION" }, timestamp: AT });
 });
 
-test("doorbellPress: an event without a correlationToken and without a context", () => {
-  assert.deepEqual(messages.doorbellPress({ endpointId: "door", messageId, timestamp: AT }), {
+test("doorbellPress: an event without a correlationToken, with the empty context of the page", () => {
+  const built = messages.doorbellPress({ endpointId: "door", messageId, timestamp: AT });
+  assert.deepEqual(built, {
     event: {
       header: { namespace: "Alexa.DoorbellEventSource", name: "DoorbellPress", messageId, payloadVersion: "3" },
       endpoint: { endpointId: "door" },
       payload: { cause: { type: "PHYSICAL_INTERACTION" }, timestamp: AT },
     },
+    context: {},
   });
+  assert.deepEqual(built.context, doc("alexa-doorbelleventsource", "DoorbellPress.event").context);
 });
 
-test("simpleEvent: the instance in the header, payloadVersion 1.0", () => {
+test("simpleEvent: the instance in the header, payloadVersion 1.0, no context as on the page", () => {
+  assert.equal("context" in doc("alexa-simpleeventsource", "Event.event"), false);
   assert.deepEqual(messages.simpleEvent({ endpointId: "button", instance: "Button.Front", id: "Button.SinglePush.1", messageId, timestamp: AT }), {
     event: {
       header: { namespace: "Alexa.SimpleEventSource", name: "Event", instance: "Button.Front", messageId, payloadVersion: "1.0" },
diff --git a/test/registry/events.test.js b/test/registry/events.test.js
index deac817..bbb6181 100644
--- a/test/registry/events.test.js
+++ b/test/registry/events.test.js
@@ -30,9 +30,15 @@ test("the events of the pages fit the payload of their descriptor, and come back
     ["Alexa.WakeOnLANController", "alexa-wakeonlancontroller", "WakeUp", "response"],
   ];
   for (const [namespace, page, name, topic] of printed) {
-    const { header, payload } = doc(page, `${name}.event`).event;
+    const example = doc(page, `${name}.event`);
+    const { header, payload } = example.event;
     const descriptor = registry.get(namespace);
     const event = descriptor.events[name];
+    // raise() sends a context where the page prints one, and the pages print an empty one or none
+    if (topic === "proactive") {
+      assert.equal(event.emptyContext === true, "context" in example, name);
+      assert.deepEqual(example.context ?? {}, {}, name);
+    }
     assert.deepEqual([header.namespace, header.name, header.payloadVersion], [namespace, event.name, descriptor.version]);
     assert.equal(event.topic, topic, name);
     assert.equal("correlationToken" in header, topic === "response", name);