May 25 is Towel Day, a tribute to Douglas Adams. The first Towel Day was held 2001, two weeks after Adams’ death. 

Don’t panic and don’t forget your towel.

Since no post office has seen fit to issue a stamp dedicated to Douglas Adams or The Hitchhiker’s Guide to the Galaxy, I’m sure a dolphin will suffice. 

Atlantic Bottlenose Dolphin (Tursiops truncatus)
From the Wild Coasts: Wildlife of Coastal UK (2021) series
Issued by Royal Mail July 22, 2021
Designer: Steers McGillan Eves

So long Douglas, and thanks for all the fish