World Tai Chi and Qigong Day (WTCQD, alternative spelling World T'ai Chi and Ch'i Kung Day) is an annual observance that has been held on the last Saturday in April since 1999. It focuses on promoting the related Chinese disciplines of tai chi chuan and qigong.
In Germanic countries, the night of April 30 is known as Walpurgis Night (Walpurgisnacht). It was so named after Saint Walpurga, an English missionary to the Frankish Empire. In German folklore this night is associated with witches.
International Jazz Day is an annual celebration, which was proclaimed by UNESCO in November 2011. UNESCO organizes it in partnership with the Thelonious Monk Institute of Jazz, a non-profit music educational organization based in Washington, D.C.
Children of South American countries, including Colombia, suffer many problems. For a long time they were subjected to abuse and mistreatment. Celebration of Children's Day helps change this situation in Colombia. The holiday is annually observed on the last Saturday in April.