If you haven't purchased your tickets yet for Wednesday night's "Not in My Back Yard" political comedy roundtable at the Upright Citizen's Brigade theater, what are you waiting for? and Charlie Todd (who created Improv Everywhere and is on the local community board! Todd says to expect lots of witty repartee about casinos, trash containers in the curbside lane and, what else, Sliwa! It sounds like a cross between a Brooklyn Community Board 6 Transportation Committee meeting and the late show at the Comedy Cellar. The fun starts at 7 p.m. at the UCB Theater on E. 14th Street.