From US Weekly:
[The Obamas] had lunch with U2 frontman Bono at NYC restaurant Stephen Starr’s Upland on Friday, March 10.
The former first couple looked fashionable and relaxed as they exited the eatery with the 56-year-old music icon, with Barack, 55, in a sharp suit with a crisp white shirt — sans tie! — and Michelle, 53, in a cool gray coat and black-and-white shirt.
Videos posted by fellow diners show that the couple left the Park Avenue restaurant to cheers and applause from the room. The former president can be seen smiling and waving at people as he makes his way outside.