Style your hair in a pompadour, put on a polka-dot dress: it’s time for Rockabilly Square! This free festival takes you back in time for an unforgettable weekend full of rock ’n’ roll in the garden of the Grote Kerk and throughout the Grotekerksbuurt neighborhood. Think classic cars, petticoats, pompadours, and, of course, music by Elvis, Johnny Cash, and others. It’s a full-day program featuring music, vendor booths, food trucks, classic cars, and a best-dressed contest.