Cupid’s Undie Run just recently came to San Francisco, though the fundraising event has been around for a few years. We did it in Seattle in 2012, and participated in the San Francisco event in 2013. The race is $ 30 to enter(all proceeds going to the neurocystic fibrosis cause) and raising an additional chunk of money will get you plenty of reward($ 150 gets you an open bar). The«race» itself is super short — ranging from half a mile to a full mile. The SF race was all of .5 miles. They give you plenty of schwag on top of that, so your $ 30 stretches pretty far. I will participate in this race/party event as many times as possible — great cause, great party, fun times.