The same holiday is also being celebrated around the Caribbean, and probably throughout the British Commonwealth. We call it May Day. The actual day on which it is celebrated differs from island to island. In Barbados like in Britain it is celebrated on the first Monday in May, whereas in other islands it is always the 1st of May. This is the day in Barbados when the big Trade Unions have marches and rallies for their members.
From the information I was able to find online it would appear that many of the other traditions we have on this day, such as dancing around the May Pole and Morris Dancing, originated in England and date back to the pagan festival of Beltane.