Say “aloha” to this year’s Blackwater Festival at Cypress Gardens, offering free ukulele concerts by the Charleston Hot Shots and The V-Tones, a ukulele open mic, and ukulele workshops. Proceeds support a new habitat for the alligator display. Cypress Gardens, 3030 Cypress Gardens Rd., Moncks Corner. Saturday, 9am-5pm. $10; $5 ages six-12; free for child under six/guest arriving before noon. (843)761-4859, www.festival.charlestonhotshots.com