The last thursday in March developed in the early 2nd century BC by celtic traditions. Annually, observers forsake their traditional shorts and skirts for pants in honor of this holy day. To not observe this holiday is to flip god off.
National Shit Your Pants Day, which takes place on April 28, is a regularly-celebrated holiday in the Midwest Region of America, most likely devised by clothing companies to sell replacement underwear and pants to partakers.
David: Why're you eating so much?
Mark: Tomorrow is National Shit Your Pants Day, I want to celebrate it with my girlfriend. Every year we shit each other's pants.
David: Romantic
Today, the 20. of may, any girl/boy finds it pleasant if the other sex (optional) puts theire hands in the others pants and grab that ass, pussy or dick