Stockholm's theater and opera season runs from September through May. Both Dramaten (the National Theater) and Operan (the Royal Opera) shut down in the summer months. When it comes to popular music, big-name international acts frequently come to Stockholm in summer while on their European tours. Artists of this type always play at one of the Stockholm Globe Arenas south of the city center.
The Stockholm Visitors Board website www.visitstockholm.com) lists the month's events in both English and Swedish.