Jack was at Peggy’s baby shower, and he and Shelley were both in the big group shot at the end of “Hard Yards”. I’m not sure how he scored an invitation, because the only time previously they were in the same panel appears to be a holiday group shot at the end-of-year break in “Into the Woods”, which I’m assuming is out-of-continuity. I figure Shelley just told Lottie “bring all your friends!”