Waitlists give you a way to capture demand once an event is sold out, instead of turning fans away with no record of who wanted in. It lives inside your branded checkout, so the experience stays on your site and consistent with the rest of your ticketing.
Every signup includes a marketing opt-in, so a sellout becomes a list you can use for the next show, a re-release, or a related event. It turns lost sales into a channel you own.