Rock to raise funds for the West/Rhode Riverkeeper at seventh annual Rhythm on the River festival, with live music by Swampcandy and local cuisine by Herrington on the Bay. Buy a chance to win a new kayak ($10/ticket). Bring lawn seating. Call ahead to arrive by boat. 5-8pm at Hartge’s Yacht Harbor, 4880 Church Ln., Galesville. $40 w/age discounts: 410-867-7171; www.westrhoderiverkeeper.org.