The “tell us your quietest night and we’ll get 20+ people to come that night” trick works wonders, not just for tech meetups but for things like karaoke nights and other kinds of adult social activities too. It’s a great win-win.
Oh, I like that! Offer to boost their quietest night. Love it :) that could work on a relatively small scale. That's really good social engineering, since one thing you have control over is your own scheduling, but they have no control on what their dead night is.
And if you packed their busiest night, they might make some more money but it might cause them problems and stress them out. Offer to boost their deadest night.
Are you a social dancer? :D Salsa dancer for over a decade and event (Congress/social) organizer for a few... I know exactly what you're talking about!
PS - the issue is that many social dancers want to dance over being social, and alcohol detracts from it. People have jobs and want to pay to contribute. We ended up settling on a cover charge that comes with food credit so people can booze up if desired, and buy water/snacks if not. Win-win.