Geek Pride Day is an initiative which claims the right of every person to be a nerd or a geek. It has been celebrated on May 25 since 2006, celebrating the premiere of the first Star Wars movie in 1977.

It shares the same day as two other science-fiction 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.

http://en.wikipedia.org/wiki/Nerd_Pride_Day