diff --git a/package-lock.json b/package-lock.json
index 1c2e975..f92b576 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -7,6 +7,7 @@
       "name": "devict-events",
       "dependencies": {
         "@fastify/swagger": "^9.7.0",
+        "@fastify/type-provider-json-schema-to-ts": "^5.0.0",
         "fastify": "^5.8.5"
       },
       "devDependencies": {
@@ -20,6 +21,15 @@
         "npm": ">=11.0.0"
       }
     },
+    "node_modules/@babel/runtime": {
+      "version": "7.29.7",
+      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.29.7.tgz",
+      "integrity": "sha512-Nq8OhGWiZIZGV6hLHoyAKLLcJihP/xFeBMGJoUrxTX2psI8dCifzLhZISFb+VWS3wFMRDmCGw5R+dOySCqPLhw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
     "node_modules/@fastify/ajv-compiler": {
       "version": "4.0.5",
       "resolved": "https://registry.npmjs.org/@fastify/ajv-compiler/-/ajv-compiler-4.0.5.tgz",
@@ -154,6 +164,15 @@
         "yaml": "^2.4.2"
       }
     },
+    "node_modules/@fastify/type-provider-json-schema-to-ts": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/@fastify/type-provider-json-schema-to-ts/-/type-provider-json-schema-to-ts-5.0.0.tgz",
+      "integrity": "sha512-erEJvxucxc09XLdHygdQua4QFyxBp+QParhXl3hrB6UvE2R6ZB9KG6TznUTz6I5HK7t5xm/vn4DG7EIOAPOO4w==",
+      "license": "MIT",
+      "dependencies": {
+        "json-schema-to-ts": "^3.1.0"
+      }
+    },
     "node_modules/@oxfmt/binding-android-arm-eabi": {
       "version": "0.54.0",
       "resolved": "https://registry.npmjs.org/@oxfmt/binding-android-arm-eabi/-/binding-android-arm-eabi-0.54.0.tgz",
@@ -1149,6 +1168,19 @@
         "url": "https://github.com/Eomm/json-schema-resolver?sponsor=1"
       }
     },
+    "node_modules/json-schema-to-ts": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/json-schema-to-ts/-/json-schema-to-ts-3.1.1.tgz",
+      "integrity": "sha512-+DWg8jCJG2TEnpy7kOm/7/AxaYoaRbjVB4LFZLySZlWn8exGs3A4OLJR966cVvU26N7X9TWxl+Jsw7dzAqKT6g==",
+      "license": "MIT",
+      "dependencies": {
+        "@babel/runtime": "^7.18.3",
+        "ts-algebra": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=16"
+      }
+    },
     "node_modules/json-schema-traverse": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-1.0.0.tgz",
@@ -1536,6 +1568,12 @@
         "node": ">=20"
       }
     },
+    "node_modules/ts-algebra": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ts-algebra/-/ts-algebra-2.0.0.tgz",
+      "integrity": "sha512-FPAhNPFMrkwz76P7cdjdmiShwMynZYN6SgOujD1urY4oNm80Ou9oMdmbR45LotcKOXoy7wSmHkRFE6Mxbrhefw==",
+      "license": "MIT"
+    },
     "node_modules/typescript": {
       "version": "6.0.3",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-6.0.3.tgz",
diff --git a/package.json b/package.json
index b901793..6a93088 100644
--- a/package.json
+++ b/package.json
@@ -16,6 +16,7 @@
   },
   "dependencies": {
     "@fastify/swagger": "^9.7.0",
+    "@fastify/type-provider-json-schema-to-ts": "^5.0.0",
     "fastify": "^5.8.5"
   },
   "devDependencies": {
diff --git a/src/api/api.ts b/src/api/api.ts
index 2a8e3be..faffafe 100644
--- a/src/api/api.ts
+++ b/src/api/api.ts
@@ -3,6 +3,8 @@
 
 import Fastify from "fastify";
 import swagger from "@fastify/swagger";
+import type { JsonSchemaToTsProvider } from "@fastify/type-provider-json-schema-to-ts";
+import type { JSONSchema } from "json-schema-to-ts";
 import type { Config } from "../config.ts";
 import { getOpenMeetClient, type OpenMeetClient } from "../openmeet/openmeet.ts";
 
@@ -17,9 +19,9 @@ const upcomingEventsResponse = {
     properties: {
       name: { type: "string" },
       slug: { type: "string" },
-      location: { tpe: "string" },
-      lat: { tpe: "string" },
-      lon: { tpe: "string" },
+      location: { type: "string" },
+      lat: { type: "string" },
+      lon: { type: "string" },
       startDate: { type: "string", format: "date-time" },
       endDate: { type: "string", format: "date-time" },
       series: {
@@ -38,14 +40,14 @@ const upcomingEventsResponse = {
     },
     required: ["name", "slug", "location", "startDate", "endDate"],
   },
-} as const;
+} as const satisfies JSONSchema;
 
 export async function startApi(
   cfg: Config,
   opts: { aborter?: AbortController; omClient?: OpenMeetClient } = {},
 ): Promise<void> {
   const { aborter, omClient } = opts;
-  const app = Fastify({ logger: true });
+  const app = Fastify({ logger: true }).withTypeProvider<JsonSchemaToTsProvider>();
 
   await app.register(swagger, {
     openapi: {
diff --git a/src/notifier/channels/slack.test.ts b/src/notifier/channels/slack.test.ts
index 647b0ec..3de6969 100644
--- a/src/notifier/channels/slack.test.ts
+++ b/src/notifier/channels/slack.test.ts
@@ -8,6 +8,11 @@ const event = (overrides: Partial<{ name: string; slug: string; startDate: strin
   slug: "hack-night",
   startDate: "2026-06-15T18:00:00Z",
   endDate: "2026-06-15T20:00:00Z",
+  location: "Boise",
+  lat: "43.615",
+  lon: "-116.202",
+  series: { id: 1, name: "Hack Night" },
+  image: { path: "/img/hack-night.png" },
   ...overrides,
 });
 
diff --git a/src/notifier/notifier.test.ts b/src/notifier/notifier.test.ts
index 71e7bf1..ce224d9 100644
--- a/src/notifier/notifier.test.ts
+++ b/src/notifier/notifier.test.ts
@@ -17,7 +17,17 @@ const ev = (
   startDate = "2026-06-10T18:00:00Z",
   name = slug,
   endDate = "2026-06-15T20:00:00Z",
-): OpenMeetEvent => ({ name, slug, startDate, endDate });
+): OpenMeetEvent => ({
+  name,
+  slug,
+  startDate,
+  endDate,
+  location: "Boise",
+  lat: "43.615",
+  lon: "-116.202",
+  series: { id: 1, name },
+  image: { path: `/img/${slug}.png` },
+});
 
 // A Config with only the fields the notifier reads. The injected client
 // ignores cfg, so the atproto/openmeet fields don't matter here.
diff --git a/src/openmeet/openmeet.ts b/src/openmeet/openmeet.ts
index ecddddf..baf87b5 100644
--- a/src/openmeet/openmeet.ts
+++ b/src/openmeet/openmeet.ts
@@ -16,6 +16,16 @@ export type OpenMeetEvent = Readonly<{
   slug: string;
   startDate: string;
   endDate: string;
+  location: string;
+  lat: string;
+  lon: string;
+  series: {
+    id: number;
+    name: string;
+  };
+  image: {
+    path: string;
+  };
 }>;
 
 export type Tokens = Readonly<{