As “Summer for the City” kicks off, open-air performances and social-dance evenings take over the plaza at Lincoln Center, through Aug. 12. On opening night, June 14, couples dance salsa under a sparkling ten-foot disco ball (designed by Clint Ramos, and pictured above), to tunes by the band 8 y Más, featuring the Barcelona-based singer Lucrecia. Also in the first week, the choreographer Kyle Abraham curates a dance festival, and a Juneteenth celebration includes a piece by the soulful Ronald K. Brown, performed by his company, EVIDENCE.