diff --git a/src/components/calendar/EventModal.tsx b/src/components/calendar/EventModal.tsx
index 169c5698..316596bc 100644
--- a/src/components/calendar/EventModal.tsx
+++ b/src/components/calendar/EventModal.tsx
@@ -67,6 +67,7 @@ import {
   participantLimitMessage,
   seedAttendees,
   userOrganizes,
+  withAttendee,
   type Attendee,
 } from '../../lib/calendar-participants';
 import type { SeriesEdit } from '../../lib/recurrence-scope-edit';
@@ -880,7 +881,7 @@ export function EventModal({
           >
             <ParticipantInput
               attendees={attendees}
-              onAdd={(a) => setAttendees((prev) => [...prev, a])}
+              onAdd={(a) => setAttendees((prev) => withAttendee(prev, a))}
               onRemove={(email) =>
                 setAttendees((prev) => prev.filter((a) => a.email.toLowerCase() !== email.toLowerCase()))
               }
diff --git a/src/components/calendar/ParticipantInput.tsx b/src/components/calendar/ParticipantInput.tsx
index 80e43ff6..6cfe8f5e 100644
--- a/src/components/calendar/ParticipantInput.tsx
+++ b/src/components/calendar/ParticipantInput.tsx
@@ -31,7 +31,14 @@ export function ParticipantInput({ attendees, onAdd, onRemove }: ParticipantInpu
   const c = useColors();
   const styles = React.useMemo(() => makeStyles(c), [c]);
   const t = useLocaleStore((s) => s.t);
-  const [draft, setDraft] = React.useState('');
+  const [draft, setDraftState] = React.useState('');
+  // Done submits and then blurs the field; both handlers run before a
+  // re-render, so they read the text from here, not from `draft`.
+  const draftRef = React.useRef('');
+  const setDraft = React.useCallback((value: string) => {
+    draftRef.current = value;
+    setDraftState(value);
+  }, []);
   // Contacts, groups and recent Sent recipients, as the composer offers them.
   const getAutocomplete = useContactsStore((s) => s.getAutocomplete);
   const getGroupRecipients = useContactsStore((s) => s.getGroupRecipients);
@@ -68,7 +75,8 @@ export function ParticipantInput({ attendees, onAdd, onRemove }: ParticipantInpu
   };
 
   const handleSubmit = () => {
-    if (draft.trim()) addParticipant(draft);
+    const typed = draftRef.current;
+    if (typed.trim()) addParticipant(typed);
   };
 
   return (
@@ -93,28 +101,8 @@ export function ParticipantInput({ attendees, onAdd, onRemove }: ParticipantInpu
         </View>
       )}
 
-      <TextInput
-        accessibilityLabel={t('calendar.event_modal.participant_placeholder', 'Add participant by email')}
-        // No full-screen keyboard in landscape: it would hide the suggestions
-        // and the text around the field.
-        disableFullscreenUI
-        value={draft}
-        onChangeText={setDraft}
-        placeholder={t('calendar.event_modal.participant_placeholder', 'Add participant by email')}
-        placeholderTextColor={c.textMuted}
-        autoCapitalize="none"
-        autoCorrect={false}
-        keyboardType="email-address"
-        // The app's own suggestions only: system autofill would cover them.
-        autoComplete="off"
-        importantForAutofill="no"
-        textContentType="none"
-        onSubmitEditing={handleSubmit}
-        onBlur={handleSubmit}
-        returnKeyType="done"
-        style={styles.input}
-      />
-
+      {/* Above the field, not below it: below, the keyboard covered the
+          list (the editor keeps only the focused field in view). */}
       {filteredSuggestions.length > 0 && (
         <ScrollView
           style={styles.suggestions}
@@ -140,6 +128,28 @@ export function ParticipantInput({ attendees, onAdd, onRemove }: ParticipantInpu
           ))}
         </ScrollView>
       )}
+
+      <TextInput
+        accessibilityLabel={t('calendar.event_modal.participant_placeholder', 'Add participant by email')}
+        // No full-screen keyboard in landscape: it would hide the suggestions
+        // and the text around the field.
+        disableFullscreenUI
+        value={draft}
+        onChangeText={setDraft}
+        placeholder={t('calendar.event_modal.participant_placeholder', 'Add participant by email')}
+        placeholderTextColor={c.textMuted}
+        autoCapitalize="none"
+        autoCorrect={false}
+        keyboardType="email-address"
+        // The app's own suggestions only: system autofill would cover them.
+        autoComplete="off"
+        importantForAutofill="no"
+        textContentType="none"
+        onSubmitEditing={handleSubmit}
+        onBlur={handleSubmit}
+        returnKeyType="done"
+        style={styles.input}
+      />
     </View>
   );
 }
diff --git a/src/components/calendar/__tests__/participant-double-add.test.ts b/src/components/calendar/__tests__/participant-double-add.test.ts
new file mode 100644
index 00000000..7bc970ee
--- /dev/null
+++ b/src/components/calendar/__tests__/participant-double-add.test.ts
@@ -0,0 +1,38 @@
+import { describe, expect, it } from 'vitest';
+import fs from 'node:fs';
+import path from 'node:path';
+import { withAttendee, type Attendee } from '../../../lib/calendar-participants';
+
+const input = fs.readFileSync(path.resolve(__dirname, '../ParticipantInput.tsx'), 'utf8');
+const editor = fs.readFileSync(path.resolve(__dirname, '../EventModal.tsx'), 'utf8');
+
+describe('adding a participant with Done', () => {
+  it('invites a typed address once although submit and blur both add it', () => {
+    // Done fires onSubmitEditing, then onBlur, before the editor re-renders:
+    // two updaters run on the same queue.
+    const typed: Attendee = { name: '', email: 'userc@example.org' };
+    let attendees: Attendee[] = [];
+    for (const updater of [(prev: Attendee[]) => withAttendee(prev, typed), (prev: Attendee[]) => withAttendee(prev, typed)]) {
+      attendees = updater(attendees);
+    }
+    expect(attendees).toEqual([typed]);
+  });
+
+  it('treats an address in other case or with spaces as the same person', () => {
+    const list = [{ name: 'C', email: 'userc@example.org' }];
+    expect(withAttendee(list, { name: '', email: ' UserC@Example.org ' })).toBe(list);
+    expect(withAttendee(list, { name: '', email: 'userb@example.org' })).toHaveLength(2);
+  });
+
+  it('adds through the dedupe in the editor and reads the typed text from a ref', () => {
+    expect(editor).toMatch(/onAdd=\{\(a\) => setAttendees\(\(prev\) => withAttendee\(prev, a\)\)\}/);
+    const submit = input.slice(input.indexOf('const handleSubmit'), input.indexOf('};', input.indexOf('const handleSubmit')));
+    expect(submit).toMatch(/draftRef\.current/);
+  });
+
+  it('shows the suggestions above the field, where the keyboard does not cover them', () => {
+    const jsx = input.slice(input.indexOf('return ('));
+    expect(jsx.indexOf('filteredSuggestions.length > 0')).toBeGreaterThan(-1);
+    expect(jsx.indexOf('filteredSuggestions.length > 0')).toBeLessThan(jsx.indexOf('<TextInput'));
+  });
+});
diff --git a/src/lib/calendar-participants.ts b/src/lib/calendar-participants.ts
index 063a2e2d..a6a48f31 100644
--- a/src/lib/calendar-participants.ts
+++ b/src/lib/calendar-participants.ts
@@ -269,6 +269,18 @@ export interface Attendee {
   email: string;
 }
 
+/**
+ * `attendees` with `added` at the end, unless that address is invited
+ * already. Done/Enter on Android submits and then blurs the field, and both
+ * add what was typed: checking against the latest list (a state updater's
+ * `prev`) keeps the second add from inviting the same person twice.
+ */
+export function withAttendee(attendees: Attendee[], added: Attendee): Attendee[] {
+  const key = added.email.trim().toLowerCase();
+  if (!key || attendees.some((a) => a.email.trim().toLowerCase() === key)) return attendees;
+  return [...attendees, added];
+}
+
 type ParticipationStatus = Participant['participationStatus'];
 
 /**