Get your dancing shoes ready, because Brooklyn Contra is hosting its annual Harvest Waltz on Friday night at Camp Friendship in South Slope. Contra is a combo of swing and square dancing, and you will be paired up with a partner to twist and twirl the night away with. Fan favorites David Sidmand’s Elastic Band and caller Gaye Fifer will be on hand to provide a tip-top community dance party experience. And no worries if you are a novice—a $15 ticket includes a free group lesson at 7:30 before the fun gets into full swing at 8pm.