Checker performed for some 3,500 people in Lincoln Center's Damrosch Park as part of the "Midsummer Night Swing" public dance series; he was invited to perform on the eve of the 50th anniversary of his recording of "The Twist," ranked number one on Billboard's "Hot 100 All-Time Top Songs" from 1958 to 2008.

Trim, grooving and flirting...