One of these Color Vibe 5K events was held in the park on my street. Estimates were that 2500 to 3000 people paid ~$40 to run in this event and have colored powder thrown at them as they ran the course. The turn-out was incredible. BTW, Color Vibe is a for profit organization, so only a small portion of the entry fees go to a local charity. I didn't see any drugs or alcohol, so that must not be the main appeal. I dunno, maybe I'm just old, but I don't get the appeal this event.