Wtf, why don't we a May Day in the US? Never heard of it before.
Looks like fun:
http://en.wikipedia.org/wiki/May_Day
Oh wait...
In some parts of the United States, May Baskets are made. These baskets are small and usually filled with flowers or treats and left at someone's doorstep. When you ring the bell, you are supposed to run away. The person receiving the basket would try to catch the person running away. If they caught the person, a kiss was to be exchanged.