Stavros Niarchos, Jessica Hart, Giovanna Battaglia, and More Fiesta d at Tijuana Picnic

While the chicettes were uptown at Central Park for the Calvin Klein Collection and Creative Time bash, the downtown party people got into the summer spirit at Jon Neidich and **Jean-Marc Houmard’**s latest venture, Tijuana Picnic. In celebration of the art set invading town for Frieze, a coterie of fashion darlings showed up for the below-ground fete including Tabitha Simmons, Giovanna Battaglia, and model Jessica Hart, who was joined by boyfriend Stavros Niarchos. As the night progressed, music from Heron Preston kept everyone—like Off-White designer Virgil Abloh, Jeanette Hayes, and CFDA/Vogue Fashion Fund finalist Gigi Burris—on the dance floor into the wee hours of the morning.