"Happenings: New York, 1958-1963" - Slide Show - NYTimes.com Patty Oldenburg (now Patty Mucha), with Claes Oldenburg, in "Store Days II" in 1962. Props from the work will be displayed in "Happenings: New York, 1958-1963," opening Friday at Pace Gallery. Credit: Claes Oldenburg; All rights reserved Robert R. McElroy/VAGA, NY; courtesy of Oldenburg van Bruggen Studio