Fun Fact: May 11, 2001: The first International Towel Day is celebrated in honor of author Douglas Adams. In 2001, the first International Towel Day was celebrated on May 11, two weeks after the passing of British author Douglas Adams. The event is an annual tribute to Adams, known for his popular "Hitchhiker's Guide to the Galaxy" series, where the towel is recognized as an essential item for any space traveler.by johnataylor on TwosFun Fact: May 11, 2001: The first International Towel Day is celebrated in honor of author Douglas Adams. In 2001, the first International Towel Day was celebrated on May 11, two weeks after the passing of British author Douglas Adams. The event is an annual tribute to Adams, known for his popular "Hitchhiker's Guide to the Galaxy" series, where the towel is recognized as an essential item for any space traveler.