Publish it, and why it is not in Find Events yet

Two controls, and they do different things.

Publish Event makes the event real: the page is live, tickets can be bought, guest passes can be sent, the door can scan. Until then it is a draft that only you and your team can see. The same button unpublishes.

Discoverable in search puts it in Find Events in the app and in search on the site. Off, the event is link-only: anyone with the link can buy, nobody can stumble on it. A private party stays off. A club night goes on.

A published event that is not discoverable is the normal state for a lot of nights, so "I published and it is not in Find Events" is usually this switch, not a problem.