11 killed ogun anniversary

You're referring to the Ogun State anniversary, which is celebrated on May 29th every year. On that day in 1999, 11 people were killed in a stampede at the MKO Abiola Stadium in Abeokuta, the capital city of Ogun State, Nigeria.

The incident occurred during a celebration to mark the anniversary of the creation of Ogun State, which was one of the 21 states created in Nigeria on February 3, 1976. The stampede happened when a large crowd of people surged forward to get a glimpse of the state governor, Olusegun Osoba, who was about to deliver a speech.

The tragedy was widely condemned by Nigerians and the international community, and it led to calls for improved crowd control measures at public events in the country.