Free events on slash.fm are RSVPs: you confirm with your phone number, your name is on the list and you get a QR code the door scans like a ticket. No fee, no card, nothing to print. Some free nights are free all night; others are free before a cutoff and the event page says which.
Organizers can require approval on a free tier, in which case you are notified in the app when you are confirmed. If plans change, message the organizer so the spot can go to someone else.
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