Mean Girls Day
Mean Girls Day is held on October 3. This event in the first decade of the month October is annual. 
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The phenomenon of social media, a widespread phenomenon in celebration of the cult 2000s film Mean Girls.
Since the deliciously mean movie hit theaters in 2004, fans have paid homage to "Mean Girls" on October 3 every year.
Mean Girls is a 2004 American teen comedy film directed by Mark Waters, and written by Tina Fey. The film stars Lindsay Lohan, Rachel McAdams, Tim Meadows, Ana Gasteyer, Amy Poehler and Fey. It is based in part on Rosalind Wiseman's 2002 non-fiction self-help book, Queen Bees and Wannabes, which describes female high school social cliques and the damaging effects they can have on girls. Fey also drew from her own experience at Upper Darby High School as an inspiration for some of the concepts in the film.
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Techie's Day on October 3
Virus Appreciation Day on October 3
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World Card Making Day on October 4 (the first Saturday in October)