OBOS The fortress is Mid-Norway's largest and coolest festival for those who like the coolest music! Artists: , -Carp , - David Guetta , -Matoma , -Postgirobygget , -Sushi X Kobe , -Hkeem , -Lil Halima More coming! Ticket sales are underway! , Be quick if you want to secure the very cheapest festival passes. The tickets are never cheaper than our early bird passports. The fortress 2018 was completely wild! We repeat the success on 30 and 31 August 2019 , at Kristiansten Festning. Age limit: 18 years! Program changes may occur. Cancellation of artists bands and subsequent program changes will not entitle you to a refund of the ticket. Refunds are only given on cancellation of the entire event. More Info below.