After you reply, the thank-you screen shows a personal link to your reply. Keep it: it’s how you change your answer later.

  1. Open your personal link, or open the invite again on the same phone.
  2. Tap Change my answer.
  3. Switch between Coming and Can’t make it, update the numbers or your note, and tap Update my reply.

You can change your answer until the reply-by date. The host’s headcount updates straight away. Anyone with your personal link can change your reply, so only share it with people in your household.