No Pants Day is simple to celebrate ... just don't wear pants this Friday. According to this article from PhillyBurbs.com:
So, I encourage you to participate in both holidays voraciously. What does that mean? Well, just drink as much as you can while pantless. Really, I don't see how anything other than good can come from that. You might want to take the day off, but that's your call. As to whether I'll be celebrating, I guess the answer is yes. Not so much because of the holidays though, but because I drink pantless everyday. Feel free to join me....
It's hard to say what No Pants Day commemorates other than simply the
freedom associated with not wearing pants.
Participants are urged to show up for work or play in modest boxer shorts
or other types of underwear, such as bloomers, slips or briefs.
But whatever you do, don't wear pants,
and wearing skirts, dresses or kilts doesn't count.