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Event organizers will need to start charging refundable deposits. If you show up, you get your deposit back.

I like what Jason Fried tried, making people pay $100 upfront, and refunding them $100 bills at the door:

Even a token fee like $5 would probably dramatically cut frivolous RSVP and noshow rates.

(I am sorta building something around this idea… lots of yak-shaving happening though.)