The Royal Guard (part of the Swedish Armed Forces) consists of around 30,000 guards. Watching this free 40-minute event of the changing of the guard in front of the King of Sweden's residence is very interesting. So when does the change of guards take place?
May - August: The changing of the guard can be witnessed with a Military Band daily at 1215 hours (Sundays and holidays at 1315 hours). In the summer season, you may even see guards on horses approaching Stockholm's Royal Palace (especially in May)!
April, September, October: The Swedish changing of the guards can be seen Wednesdays & Saturdays at 1215 hours, and Sundays at 1315 hours. Around April 30th - the King's birthday - look for horse displays as well.
In the winter months (November - March), the event is not as big but still worth watching! During that time, the Royal Guard publicly changes on Wednesdays & Saturdays at 1200. On Sundays spectators at the Royal Palace in Stockholm can view them at 1300 hours. The holiday season often includes additional events.
I hope you decide to witness the changing of the Royal Guard and enjoy the free entertainment by the Military Bands. Or, take a look at other annual events in Sweden.