This photographic exhibition and sale features candid photos of John Lennon and friends that May Pang took during Lennon's "lost weekend" in the 1970s. The exhibit, which will be on display this weekend at the Treelawn to coincide with the digital release of the feature film documentary, can be viewed from 4 to 8 p.m. (during Walk All Over Waterloo!), from noon to 6 p.m. tomorrow and from noon to 4 p.m. on Sunday. The George Martins will perform tonight at 8 (admission fee required).