Spanish tradition + New Orleans music + Arizona roller-derby skaters = San Fermin de Tempe. Based on on Spain's iconic running of the bulls, the festival invites participants to don their best all-white clothing and get ready to race away from pursuers down the streets of Tempe. However, unlike their Spanish compatriots, runners aren't escaping angry bulls. Instead, they flee from "Rollerbulls"—roller-derby skaters donning faux horns and armed with safe Nerf bats. After evading the skaters, runners can take in the "Best Bull" costume contest and the party continues with DJs at Fat Tuesday and Handlebar bars until 2 a.m.