Every event starts Private: only your group sees it. You can open one to the public, and you can choose to show your public events on Happening near you, a page anyone can read.
What the public sees: the event name, your group's name, the place and its address, the date, the time, and Free or the cover. Never a member's name, and nothing else from your group.
Review: AI looks at every listing before it shows, usually in under a minute. Anything it is unsure about waits for a person at GLAR.
Changes: change the event and the listing is reviewed again, then updates. Call the event off and the listing stays, marked Cancelled, until its date has passed, so people who planned to come find out. After the date, listings come off the board by themselves.
Where it shows: a visitor sees events near them when their phone or computer shares a location, or near a town they type. The area comes from the venue's town, or your group's Based in town when the event has no venue.