Akershus Fortress (outdoor areas)
Armed Forces Museum
Astrup Fearnley Museum of Modern Art
Botanical Garden
Historical Museum 
International Culture Centre & Museum IKM
Munch Museum (free 23 january–31 March)
Museum of Architecture
Museum of Decorative Arts and Design
National Gallery
National Museum of Contemporary Art
Norwegian Customs Museum
Norwegian Museum of Magic 
Oslo City Museum
Stenersen Museum (free 1 October - 31 March)
Vigeland Museum (free 1 October - 31 March)
Vigeland Sculpture Park

February/March Holmenkollen FIS World Cup Nordic  Not in 2009! (join the thousands of people gathering in the woods - remember to bring something hot to drink and warm clothes)
May + September Ekeberg veteran cars/bric-a-brac market 
May National Day: Children's parade, Russetoget and 17 May for all
June National Music Day Oslo
June Oslo Environmental Festival
June VG Top 20 live
August Mela Multicultural Festival 
August The Akershus Concert
August Oslomarkedet Arts & Crafts Fair
August/Sept Oslo Fjord & Coast Culture Festival
September Kongene på Haugen Music Festival
September Granittrock
September Oslo Culture Night
September Akerselva: River Walk by Torchlight
October Books in the Centre
Nov./Dec. Lighting of Christmas trees and streets in the centre (1st weekend of Advent)
December Nobel Peace Prize (participate in the torch parade honouring the laureate – from Karl Johan to the Grand Hotel)

Free activities

Oslo’s location between the fjord and the forest provides many options when it comes to free activities! Enjoy the outdoors and go for a hike in the forest or take a trip to the islands – by foot, on skis or by bike.
Outdoor activities in Oslo

On a hot summer day you can also enjoy life in one of the many parks in the city! Do as the locals: buy a disposable grill and prepare your lunch outdoors.
Parks in Oslo