The closest international airport is Calgary and most airline carriers fly to Calgary. Registration does not include transport to / from Calgary Airport. There are scheduled bus services from Calgary airport to Banff & Lake Louise. These can be booked online or teams can liaise with the organisers for group transfers. Many accommodation bookings will include airport transfers.
Banff also has exceptional road and public transport links. The TransCanada Highway is open year-round and is a well maintained and well-travelled road that winds through the Canadian Rockies and along the Banff National Park.