Launched by the Postojna Youth Centre in 1997 as a two-day event, the Zmaj 'ma mlade Festival ("The Dragon has Youngsters" Festival) now takes place annually for at least two weeks in August at various venues in the city centre of Postojna. It is organised by Postojna Youth Centre and sponsored by the Postojna Student Club, the Municipality of Postojna and lately, due to lack of resources, also by Društvo podpornikov Zmaj 'ma mlade (Association of Supporters of the Festival), which consists of Postojna residents who financially support the festival. The festival offers visitors days full of culture and entertainment, plus pleasant holiday evenings in the town centre. The festival is an important complement to the cultural programmes of the city of Postojna.
The programme is thematically divided according to the days of the week. Some days are divided according to musical flavours, covering world music, jazz to pop-rock, and regarding other cultural events, such as theatre performances, art exhibitions, children workshops and sport activities. Attendance is free of charge, and not only that, on the opening night of the festival you can also get a free piece of cake.
The festival was launched to spice up Postojna's summer social life and to promote youth organisations in Postojna, especially the Postojna Youth Centre. By 2001, thanks to being well-received and anticipated among the residents and wider spectre of visitors, the festival was prolonged to a whole month and continued to be such until 2010. Due to the municipality's recent funding cuts, the festival has been shortened to two weeks.