Towel Day is celebrated every year on 25 May as a tribute to the author Douglas Adams by his fans. On this day, fans carry a towel with them, as described in Adams' The Hitchhiker's Guide to the Galaxy, to demonstrate their appreciation for the books and the author. The commemoration was first held in 2001, two weeks after Adams' death on 11 May 2001.
All details taken directly from provider content at http://en.wikipedia.org/wiki/Towel_Day
National Tap Dance Day falls on May 25 every year and is a celebration of tap dancing as an American art form. The idea of National Tap Dance Day was first presented to U.S. Congress on February 7, 1989 and was signed into American law by President George H.W. Bush on November 8, 1989. The one-time official observance was on May 25, 1989. Tap Dance Day is also celebrated in other countries, particularly Japan, Australia, India and Iceland.
National Tap Dance Day was the brainchild of Carol Vaughn, Nicola Daval, and Linda Christensen. They deemed May 25 appropriate for this holiday because it is the birthday of Bill ""Bojangles"" Robinson, a significant contributor to tap dance.
Tap dance day can be celebrated with an event which may be organized by a studio or tap dance interest group. Some may also celebrate it individually due to geographical dispersion or lack of access to the wider tap community. National Tap Dance Day is celebrated in many different ways. For example, a studio may send people out onto the streets to teach the ""Shim Sham Shimmy"" to passers-by. However, there are several cities (particularly in America) that have their own performances and events to coincide with Tap Dance Day.
Geek Pride Day (Spanish: DÃa del orgullo friki ) is an initiative to promote geek culture, celebrated annually on 25 May. The date was chosen as to commemorate the 1977 release of Star Wars (see Star Wars Day), but shares the same date as two other similar fan ""holidays"": Towel Day, for fans of The Hitchhiker's Guide to the Galaxy trilogy by Douglas Adams, and the Glorious 25th of May for fans of Terry Pratchett's Discworld.
The initiative originated in Spain in 2006 as ""DÃa del Orgullo Friki"" and spread around the world via the Internet.