Please consider using low carbon emission transport to the meeting. Trains within Sweden can be booked on SJ for most cities and MTR express for selected destinations. Check your local train provider for services towards Sweden or use an on-line tool such as MTR express or Happyrail amongst many others. It is also possible to take the ferry to Stockholm from destinations around the Baltic via Tallink, Viking Line or St. Peter Line.
There are two international airports in Stockholm. Arlanda (ARN) is the larger international airport. You can get to the city from Arlanda by taxi (stand outside arrivals terminal), bus, shared taxi or by a 20-minute trip on the express train, the Arlanda Express. Bromma (BMA) is a smaller airport flying to a number of Swedish, and a few European, destinations. Transport from the city to Bromma is via taxi or bus (SL or Flygbussarna)