Africa Day and African Liberation Day are celebrated on May 25. These two holidays currently commemorate the same event, the establishment of the Organization of African Unity. May 25 it celebrated as a public holiday in some African countries.
World Thyroid Day is an annual awareness day that was established in 2008 during the congress of the European Thyroid Association (ETA). It focuses on increasing awareness of thyroid health and educating about prevention and treatment of thyroid diseases.
Every year hundreds of children are abducted, and only few of them are recovered. International Missing Children's Day, that is annually observed on May 25, raises public awareness about the missing children and spreads message of hope among their families.
Geek Pride Day is an annual celebration that focuses on promoting geek culture. It is held on May 25 to commemorate the release of the first film in the Star Wars franchise (now known as Star Wars Episode IV: A New Hope) in 1977.
Towel Day is an informal holiday celebrated on May 25 by the fans of Douglas Adams, English science fiction writer. Adams is best know for his The Hitchhiker's Guide to the Galaxy series. Towel Day was created as a tribute to Adams two weeks after his death in 2001.
The Glorious Twenty-Fifth of May, also referred to as Wear the Lilac Day, is an annual celebration observed by fans of Terry Pratchett's Discworld series. Lately it has also become an impromptu Alzheimer's disease awareness day.