What should have a celebrated National Holiday that currently doesn't?

Survey Says:

"The Muppets"
"Me"/"My birthday"
"Batman's Birthday"
"My vagina"
"Election Day"
"Ben and Jerry's Ice Cream Day"
"Cheesecake"

Note: none of these is my response, despite the multiple uses of the possessive "my." I've already decided that there should be a National Gerund Day, a National Irony Day and a National Random Question of the Day Day.