It’s B-A-C-K — the event that put Dusty Bottoms Trail Runners on the map. The rules are simple: drink a beer, run 400 yards. Repeat four times and don’t hurl, and you receive a custom finishers’ medal. The ultra involves running six laps and chugging six beers. This is a BYOB (bring your own beer) event. Plan to bring a designated driver, too. Spectators always welcome! Unique overall finishers’ awards as well as a raffle with loads of cool prizes, so bring a few $$ to buy tickets. For more information or to register online, visit RunSignUp.com.