Learn About Composting Day
Learn About Composting Day is held on May 29. This event in the third decade of the month may is annual.
Cellophane Tape Day on May 27 (Cellophane tape was invented in the 1930’s with the purpose of putting a seal on an amazing new substance called, you guessed it, cellophane);
Venezuela Arbor Day on May 30 (celebrated on the last Sunday in May);
Steppe Day in Ukraine on May 30 (2017);