Colours of Ostrava, or simply Colours, is a multi-genre festival, the biggest international music festival in the Czech Republic and one of the biggest music events in Central Europe, held every summer in the centre of Ostrava, the third biggest city in the country. Colours celebrated its 10th anniversary in 2011, being held from 14 to 17 July. Colours features 16 stages including 4 big open-air stages (the main stage of which has capacity of 15,000 people), 6 indoor stages, a theatre stage, a workshop stage, a kids stage, a cinema and live discussions.