From the airport You can choose the more expensive alternative Flytoget that runs every 10 minutes to Oslo Central Station. Flytoget.no
The cheaper and just as convenient option is to take the local train that runs every 20 minutes to Oslo Central Station. L10, R11 and R12. Ruter.no
Taxi is unfortunately slow and expensive in Norway.
From the train station Go by buss 31 Tonsenhagen or buss 31 Grorud. The busstopp is called Årvollveien. It’s a 1 minute walk from the bus stop to the venue Årvoll gård. The bus runs every ten minutes daytime and twice every hour nighttime.
Tickets and travel info. Visit ruter.no and download the Ruter app for tickets and travel information. You can use the app to pay for local train rides from Gardermoen airport and also for tickets on the local busses.
The venue. The classes and parties will be held at Årvoll gård, Årvollveien 35, 0590 Oslo.
Google maps link to Årvoll Gård https://goo.gl/maps/4qPudUxUJSwWgxj3A