May Day

May 1st has got two very importan events:
It is the time of year when warmer weather begins and flowers and trees start to blossom. It is said to be a time of love and romance. It is when people celebrate the coming of summer with lots of different customs that are expressions of joy and hope after a long winter.
http://www.woodlands-junior.kent.sch.uk/customs/questions/mayday.htm

And International Workers' Day
http://en.wikipedia.org/wiki/May_Day