May 25th marks Towel Day, a celebration of Douglas Adams' work, particularly "The Hitchhiker's Guide to the Galaxy". Fans commemorate the author by carrying towels with them, inspired by a quote from the book: "A towel is about the most massively useful thing an interstellar hitchhiker can have." The number 42 holds significance as the answer to the Ultimate Question of Life, the Universe and Everything. This year's Towel Day celebrations are limited due to the pandemic but fans can still participate online or at home by checking out live readings, competitions, and quotes from Douglas Adams' work.