SANDWICHED IN: Long Island Biennial. Join Dorothy Cappadonna, docent at The Heckscher Museum of Art, for an illustrated presentation on the Long Island Biennial, a juried exhibition featuring work by artists and filmmakers of Nassau and Suffolk Counties. Inaugurated in 2010, the Long Island Biennial offers Long Island’s contemporary artists an opportunity to show their work to a broad public, deepening the connections among artists and between artists and the communities in which they live. The exhibit continues through August 12. 12:10 p.m.