Saturday 25 May is Towel Day.
What, I hear you exclaim, is Towel Day? Yes, that's right it is the day on which we are encouraged to carry a towel in tribute to the late Douglas Adams, author of The Hitchhiker's Guide to the Galaxy. On 25 May 2001, two weeks after Douglas Adam's untimely death, his fans carried a towel in his honour. And they have done so every year since.
If you've already read The Hitchhiker's Guide to the Galaxy you'll know the importance of your towel. If not, the book will explain why a towel is the most important item a space-travelling hitch-hiker (indeed probably any of us — just ask Linus!) can have.
Your towel is extremely practical: you can use it to keep warm, to lie on, to sleep on and to use as a mini-raft as you sail down the River Moth! Of course your towel is also a trusty companion and thus extremely important for a host of psychological reasons.
Towel Day isn't just a day for doing the obvious: carrying a towel. There are also lots of events, all listed over on the Towel Day website at http://towelday.org/.