May 1, International Workers' Day: Also known as Labor Day in some countries, this day is a celebration of laborers and the working classes.

May 5, Cinco de Mayo: Commemorates the Mexican Army's victory over the French Empire at the Battle of Puebla in 1862. It's widely celebrated in the United States to honor Mexican culture and heritage.

May 12, Mother's Day: Celebrated on the second Sunday in May, it's a day to honor and celebrate mothers and mother figures.

May 20, Victoria Day: Canadian holiday on which the British sovereign's birthday is celebrated. In 1845, during the reign of Queen Victoria, May 24, the queen's birthday, was declared a holiday in Canada.

May 27, Memorial Day: This US holiday honors military personnel who have died in the performance of their military duties. It is also the unofficial start of summer.