diff --git a/hugo-apps/src/app-space/AppSpace.vue b/hugo-apps/src/app-space/AppSpace.vue
index 63ae089e9..e894b0f04 100644
--- a/hugo-apps/src/app-space/AppSpace.vue
+++ b/hugo-apps/src/app-space/AppSpace.vue
@@ -138,7 +138,12 @@ onMounted(async () => {
     activeTheme.value = theme
   }
 
-  const eidParam = params.get('eventId')
+  // Read `eventId` case-insensitively: users land on links like
+  // /app-space/?eventid=... (lowercase) and URLSearchParams.get is case-sensitive.
+  let eidParam: string | null = null
+  for (const [k, v] of params) {
+    if (k.toLowerCase() === 'eventid') { eidParam = v; break }
+  }
   if (eidParam) eventId.value = Number(eidParam)
 
   const data = await loadData()
diff --git a/hugo-apps/src/app-space/__tests__/AppSpace.eventid-case.test.ts b/hugo-apps/src/app-space/__tests__/AppSpace.eventid-case.test.ts
new file mode 100644
index 000000000..f6084b800
--- /dev/null
+++ b/hugo-apps/src/app-space/__tests__/AppSpace.eventid-case.test.ts
@@ -0,0 +1,54 @@
+// @vitest-environment happy-dom
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+import { mount, flushPromises } from '@vue/test-utils'
+
+// Regression: the `eventId` URL query param must be read case-insensitively.
+// Users were hitting /app-space/?eventid=... (lowercase) and getting the
+// default event because URLSearchParams.get('eventId') is case-sensitive.
+
+vi.mock('../useRealtimeProgress', async () => {
+  const { ref } = await import('vue')
+  return { useRealtimeProgress: () => ({ lastCompletion: ref(null), connected: ref(false) }) }
+})
+
+import AppSpace from '../AppSpace.vue'
+
+const eventBody = {
+  eventId: 10000015,
+  eventName: 'Case Insensitive Event',
+  eventDescription: '<p>ok</p>',
+  eventType: 'DEVTOBERFEST',
+  authenticated: false,
+  type: 'COMPLEX',
+  paths: [{
+    id: 1, title: 'Track A', description: '', items: [
+      { imsId: 1, title: 'Tut 1', type: 'TUTORIAL', status: '', progress: 0, experience: '', timeToComplete: 0, url: '/tutorials/x.html', description: '' }
+    ]
+  }]
+}
+
+describe('AppSpace eventId query param is case-insensitive', () => {
+  beforeEach(() => {
+    vi.restoreAllMocks()
+  })
+
+  for (const key of ['eventId', 'eventid', 'EVENTID', 'EventId']) {
+    it(`reads the event id from ?${key}=10000015`, async () => {
+      window.history.replaceState({}, '', `/app-space/?${key}=10000015`)
+      const fetchSpy = vi.fn(async (input: unknown) => {
+        const url = String(input)
+        if (url.includes('getAppSpaceProgress')) return { ok: true, status: 200, json: async () => eventBody }
+        return { ok: false, status: 404, json: async () => ({}) }
+      })
+      vi.stubGlobal('fetch', fetchSpy as unknown as typeof fetch)
+
+      mount(AppSpace)
+      await flushPromises()
+
+      // The backend call must carry the id read from the URL, not the default 0.
+      const urls = fetchSpy.mock.calls.map((c) => String(c[0]))
+      expect(urls.some((u) => u.includes('eventLegacyId=10000015'))).toBe(true)
+      expect(urls.some((u) => u.includes('eventLegacyId=0'))).toBe(false)
+    })
+  }
+})