Last night found the Guggenheim, hosting a book party for Danielle Ganek's Lulu Meets God and Doubts Him, an art-world tell-all, appropriately crawling with Upper East Side collector types. "Is Larry [Gagosian] here yet?" was the recurring whisper up and down the spiral gallery — until an even heavier hitter dropped in. At around 7:15 p.m., many burly security guards began to traverse the crowd, and soon several handlers were ushering in none other than Michael Bloomberg. Awkwardly, the mayor was not there for the festivities: He'd come specifically to take in Alyson Shotz's "The Shape of Space," the title piece of Guggenheim's current here's-a-little-something-while-we're-renovating exhibit. No matter. The Lulu people saw a good chance, and they took it. A lightning-quick negotiation took place behind the wall-like sculpture, and within a minute, the mayor was holding up Lulu Meets God for the cameras and being snapped mid-chitchat with the author. After another minute of this, the genial if slightly befuddled Bloomberg made a brisk exit, with the muscle clearing the way. The party, having officially bested its own Scheduled to Appear list, pressed on. —Michael Idov