If you set a limit for the max size of your event, when that limit is reached by default activists who visit your event page will see a message that the event is full and is not taking further RSVPs.
Instead, you can redirect them to another page, for example, a form to take waitlist signups. To do so, in the "Responses" tab on your event's manage page, enter a URL in the "Event Limit Reached Redirect Link" box and save. We will redirect activists visiting the Action Network event page to this other URL if the event's limit has been reached. (We will not redirect activists visiting a page you've set up with an embedded widget. Instead, you can replace the widget you've embedded with the new form or redirect the embedding page yourself.)