According to the guide "a towel ... is about the most massively useful thing an interstellar hitchhiker can have. Partly, it has great practical value.... More importantly, a towel has immense psychological value."
Want to get involved?
- Help get the word out through social media (#towelday).
- Inform the good people at towleday.org about events you organize, and they'll announce them on the site.
- Carry a towel everywhere on Towel Day!