I once got a club night for an event called "Sold Out" and while I could see what the organisers were trying to do with that - give the idea it was popular - I could also see what a mind-blowingly terrible name it actually was, giving the impression of a) being "sold out" so not worth trying to get a ticket for, and b) being a "sell out" which is not the impression any brand trying to be cool should give.

A friend was booked to DJ there and apparently it was not sold out, it was barely attended at all, to my complete lack of surprise :D