See U.S. Royalty for free at noon today. (Photo by Katherine Frey/The Washington Post)

The throwback rockers delivered a standout set earlier this year at Sweetlife Festival, the big concert presented by the ambitious local salad shop that has hosted concerts by acts such as Toro y Moi and Dale Earnhardt Jr. Jr. at its other downtown locations. The grand opening will also feature plenty of free salad and a giveaway for a pair of free tickets to Saturday’s Animal Collective show at Merriweather Post Pavilion.