In the '70s and '80s, the roller rink was the ultimate teen hangout, the place to see and be seen. While chilling out at the rink is less in vogue, watching someone skate has never been more in or more fun--especially when it's the Boise River Rollers (treasurevalleyrollergirls.net). See the likes of Raggedy Ann-hilation, Dawn of the Shred, Shebrew Hammer, Lemon Harangue Die, Ana Highway To Hell and Boobie Houser M.D. block, jam, hip check, duck walk, eat the baby, hit it and quit it and pull off an Emilio Estevez on their way to derby domination. Watch BRR vs. Sierra Regional at 7 p.m., then see the Treasure Valley Rollergirls Allstars take on Sonoma County at 8 p.m. Proceeds benefit ALPHA.