A tribute to The Grateful Dead featuring Half Step will perform from 7 to 8:30 p.m. with a rain date on Sunday, Aug. 12, from 7 to 8:30 p.m., followed by Almost Brothers, a tribute to the Allman Brothers, from 8:45 to 10:15 p.m. at Manorhaven Beach Park at 158 Manorhaven Blvd. in Port Washington. The concert is free; parking fees apply.