World Veterinary Day is a global professional observance celebrated annually on the last Sunday in April. It was established in 2000 by the World Veterinary Association (WVA).
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.