National Month for ???

I think people decided to set up months to celebrate unusual things so people can recognize things that they wouldn't usually think of and celebrate what ever that month is for.  I think some people do and some people do not depending on who it is.  Memorial day, cinco de mayo, and spring.  The other holiday I would like to celebrate in May is I dont know.  I can't think of nothing else that we could possibly choose to celebrate this month so I don't know.