(ENDURANCE THEATER) The "world's quickest theater festival" is back. 14/48 is a biannual slam dance between writers, directors, actors, and crew who crank out 14 new plays in 48 hours with a process that privileges riffing over rewriting. The artistic value will oscillate wildly, but the entertainment value is always high, from hilarious flailing to inspired on-the-spot innovation. (Capitol Hill Arts Center, 1621 12th Ave, 800–838–3006. 8 and 10:30 pm, Fri–Sat, $14.48.) BRENDAN KILEY