We swear to God, D.C. is the only town where every main street looks like a ghost town during the nights when prez and vice prez debates take place. You know what? You deserve a night out if you watched that entire snoozefest on C-SPAN yesterday evening. Have at it: The bluesy-rock act the Black Keys hit up the 9:30 Club. The Hill’s Third Annual Political Book Fair takes place at Trover Shop, 221 Pennsylvania…