This Pride Flag was the first Rainbow Flag flown above Liverpool Town Hall. It was flown to mark International Day Against Homophobia, Biphobia and Transphobia (IDAHO) on 17 May 2009. Liverpool was the first city in the UK to officially mark IDAHO with a free programme of events. In 2008 the Liverpool LGBT network began to campaign for an official Pride event in the city, which became more essential following the homophobic murder of Liverpool teenager Michael Causer that year. IDAHO 2009 was used to consult with local LGBT communities to decide how Pride should work in Liverpool and people were also invited to sign a book of condolence for the family of Michael Causer. IDAHO is now celebrated in over 120 countries worldwide and the Museum of Liverpool raises a Pride flag to mark it each year.