Summer is the season when gala circuit regulars loosen their ties and let their hair down, and few places are more beloved for that than Storm King Art Center’s Summer Night. This past weekend, the sculpture park celebrated its second and final summer gathering of the year. Supporters convened for a seated dinner catered by Fancy Feast Supper Club. Afterward, a wider swath of attendees joined for a musical performance by Helado Negro and took in the center’s rolling hills and installations, including Alicja Kwade’s Linienland.