How to close sign-ups at a deadline

You can close the whole form at a specific date and time. After it passes, the page shows a clear "Sign-ups are closed" message and no one can submit, even with the page already open. It's enforced on the server, so a late submission can't slip through.

Steps

1. In chat, say when it should close (for example, "close sign-ups at noon on July 1", "deadline is Friday at 5pm", or "no sign-ups after the 15th").
2. While the form is open, it shows when sign-ups close so people know.
3. Once the time passes, the form switches to a "Sign-ups are closed" notice on its own.

The deadline closes the whole form (not one option), and a date with no time closes at the end of that day. To reopen it, switch Open for sign-ups back on in Setup, or ask in chat to remove or change the deadline. The people who already signed up are not affected.