Adam Bernbach (left) tends bar at Benjamin’s Bar Mitzvah as Dan Searing looks on. There was no hora, chicken dance, or karaoke at Benjamin’s Bar Mitzvah last night. No dinner buffet or pajama pants party favors. But there was an adult version of a Shirley Temple. Latch Key Productions’ faux simcha last night at the Warehouse Theater was not in fact a coming of age celebration, but a venue to mix up some creative…