Simon promises to deliver last-minute on a bar mitzvah to impress a new client, forcing Lauren to be the "party pepper" and Zach to MC. Unfortunately, Zach's old flame - the only woman he's ever loved - is also performing at this bar mitzvah, causing Zach to upend the festivities as he tries to get out of her why exactly she left him all those years ago. Sydney reassesses her "needs" list for a romantic partner and makes out with one of the cater waiters...ultimately getting him fired from his catering job.