The date was chosen as to commemorate the release of the first Star Wars film, A New Hope on 25 May 1977 (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.
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A separate initiative for observing Geek Pride Day on May 25 is based on the Star Wars connection along with ties to The Hitchhiker's Guide to the Galaxy (see Towel Day) and Discworld.