Friday's Rio Nightlife Pick - Shape is happening tonight at Catrin, local Mexican restaurant and bar by evening, banging underground club at night. Arrive early to taste the flavor of Mexico city, while putting back some top notch margaritas and beer. Then head upstairs for the party Shape, which will feature some special producers from Diamond Clash records, in association with Plano B and Punch Underground. Arrive early to win 2 shots of vodka to get the night started . . .