From Oslo, flights leave regularely from 8am. The conference starts at 2pm, so most of you wil be able to reach the conference without staying over.
From Stocholm there are direct flights on Thursdays and Sundays. If you come a few days early, or stay two days late, this is a good option.
From the airport, Langnes, in Tromsø, you take a Taxi or Bus to the city senter. The bus stops at Prostneset which is 100 meters from the Conference Hotel. The bus costs 70 kroner, while taxi is between 150 and 200.