Helsinki airport is easily accessible from all over the world. A smaller airport in Kajaani (560 km from Helsinki) is located 43 km from Vuokatti and the Congress site. Bus transportation from Kajaani airport to Vuokatti Sport is provided. A one way ticket cost around 13 euros.
Please note that the airport bus transportation is not available for the 05:25 flight in the morning from Vuokatti-Kajaani and from the 22:40 flight in the evening from Kajaani-Vuokatti.
More travel information from Kajaani airport: https://www.finavia.fi/en/airports/kajaani
Kajaani can also be reached by train. Finnish railway company: https://www.vr.fi/cs/vr/en/frontpage