FLOAT—Other towns dream of this sort of event: Free demos of kayaks, paddleboards and other watercraft, an easy-flowing river a stone's throw away, and fun-spirited Americana bands starting in the late, lazy afternoon and melting into the summer evenings. With a rollicking cover of Springsteen's "I'm on Fire," The Blackberry Bushes is a fun-spirited band that kickstarts the summer series. 4-9 pm.