It’s nearly Passover, a holiday I’ve always loved, despite the eight-day bread withdrawal. But before I dive into preparations for the weekend’s Seder, I’ll be swinging by Union Hall on Wednesday for “Fiddler on the Rooftop Bar,” a cheeky riff on the classic musical. Tevye and Golde are no longer parents facing eviction from their village in Tsarist Russia, but rather, a pair of Williamsburg roommates forced to do the unthinkable when the L shuts down — move to Astoria. Horror of horrors, am I right? It’s not quite tradition, but with the folks behind Brooklyn-centric parody “Handmaid’s Tale: The Musical” at the helm, it’s bound to inspire a l’chaim. Tickets are $8 in advance or $10 day of, and the show starts at 8 pm.