Grammatically, Presidents' Day is most correct. Legally, it depends on the laws of the state where you live (spelling varies among the states which observe a Presidents' Day -- federally there is no...
No it is not. It can be but it changes every year. Last year it was on my birthday and its on the 19th. So it can br but its not every year!Hope this helps.
Presidential elections occur on the first Tuesday after the first Monday every year that is divisible by four. The next presidential election will occur on November 6, 2012.