With Seinfeld sold out, comedy fans have Mulaney, Posehn, Pete Holmes this week

All three of Jerry Seinfeld's shows at the Mahaffey Theater this weekend in St. Petersburg are sold out. But be grateful if you don't have tickets, comedy fans, because that frees you up to check out some truly great alternative and rising comics who are in Tampa Bay this week, from John Mulaney, a boy next door with a dark side, to cult …