Top Belgrade clubs. First of all there here are winter and summer Belgrade clubs. Winter Nightclubs are located downtown. Their busy season stretches from October through May. In the summer Belgrade party moves to the rivers. River summer nightclubs have their opening nights in May. Actually those are big open-air rafts boats. They have been smoothly remodelled into discotheques. The most popular Belgrade clubs are those at the River Sava. Party starts from Brankov Bridge and go up to the point where river Sava meets Danube. Danube the wildest longest river in the Europe.