I've seen some successful gofundme pages before but they always have a caveat that if the goal isn't reached then the money will be returned. They also offer packages that grow with the donations.
Packages such as:
$250 gets you $200 in gift certificates and signed photographs of you with Marvin.
$500 for a night of food and drinks for 4 complete with pictures and autographs. Would cost the bar very little (relatively speaking) and you'd probably find people still paying some money anyway. Some people may just save the check and never cash in on it.
In DC, I'm sure you could offer $5,000 - $10,000 packages for a closed party catered event for Xmas parties, weddings, etc. You could get there in no time.