|Fandom:||The Hitchhiker's Guide to the Galaxy|
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Towel Day is celebrated by fans of The Hitchhiker's Guide to the Galaxy every year on May 25. On this day, fans carry towels (the most massively useful thing an interstellar hitchhiker can have) to demonstrate their appreciation for the series, and in tribute to the late Douglas Adams.
Douglas Adams will be missed by his fans worldwide. So that all his fans everywhere can pay tribute to this genius, I propose that two weeks after his passing (May 25, 2001) be marked as "Towel Day". All Douglas Adams fans are encouraged to carry a towel with them for the day.
Make sure that the towel is conspicous- use it as a talking point to encourage those who have never read the Hitchhiker's Guide to go pick up a copy. Wrap it around your head, use it as a weapon, soak it in nutrients- whatever you want!
Most minds in the universe are constrained to the laws of Physics; let us remember those that broke the law and got away with it.
So long Douglas, and thanks for all the fish! 
Towel Day is now celebrated by fans in a variety of ways, creating videos, sharing pictures, attending online and in-person meetups, reading from the novels or radio series, etc.