After his century-long sleep, the irrepressible Harlequin is wide awake and ready to charm ballet lovers of all ages. The 19th-century choreographer Marius Petipa made classical ballet’s most enduring works, including Swan Lake and The Sleeping Beauty. Alexei Ratmansky, former director of the Bolshoi Ballet and artist in residence at American Ballet Theatre, has immersed himself in the original notation of Petipa’s oeuvre, producing meticulously researched revivals. His latest is the 1900 ballet Harlequinade, a lively romp based on commedia dell’arte. Harlequin and Columbine are in love, but her father, who wants her to marry a rich older man, has her locked up by Pierrot, his loyal servant. Pierrot’s wife, sympathetic to the young couple, helps her escape, and a Good Fairy gives Harlequin a magical slap stick that helps him triumph over the odds and win Columbine’s hand.