A public group is a venue’s or a business’s — the pub, the gym, the club: ask for one with its name, website and city, and FomoMate checks it before it goes live.
Anyone finds it and joins with a tap; only the venue posts, and everyone who joined says In or Out.
Or find one: Search, by name or city — or + New group, then Join one near you on the map; a tap to join.