April 29 - International Dance Day (aka World Dance Day). Introduced by the International Dance Committee of the UNESCO International Theatre Institute in 1982. The date is the anniversary of Jean-Georges Noverre (1727-1810), the creator of modern ballet. Promoted by the International Dance Council (CID).
April 30 - International Jazz Day
May 26 - World Lindy Hop Day. May 26th, 1914 is the anniversary for Frankie Manning. Sing Lim conceived of the holiday leading up to Frankie 100 and was celebrated for the first time on May 26th, 2014 as part of the Frankie Centennial event.