Sikkim Statehood Day is observed in Sikkim, India, every May 16, commemorating the day in 1975 when Sikkim became the 22nd state of the Indian Union. The celebration marks the transition of Sikkim from a monarchy to a state within India, following a referendum that led to the abolition of the monarchy. Historically, Sikkim was founded by the Tibetan prince Khye Bumsa in the 13th or 14th century and later became a British protectorate. The day is significant for recognizing Sikkim's unique cultural heritage and its journey towards statehood. Observances may include public events and discussions reflecting on Sikkim's history and identity.