According to Wikipedia, May Day was a traditional summer holiday in many pre-Christian European pagan cultures. While February 1 was the first day of Spring, May 1 was the first day of summer; hence, the summer solstice on June 25 (now June 21) was Midsummer. In the Roman Catholic tradition, May is observed as Mary’s month, and in these circles May Day is usually a celebration of the Blessed Virgin Mary.
Happy May Day! Summer is finally here again!