There are several fast trains daily from most cities in Sweden and Norway, as well as good connections from the capital cities in the rest of Europe.
Vy bus provides a number of destinations in Sweden, Norway and Denmark.
Stena Line will take you to Sweden and Göteborg from Denmark, Germany, Poland and Latvia.
Göteborg Landvetter Airport has good connections all over the world. The trip with airport shuttle buses between the airport and city centre takes about 20 minutes. Find tickets and schedule here
Tram or bus will take you smoothly and quickly to the festival area. The nearest stop is called Järntorget. Find connections here. For details about the ticket system visit Västtrafiks website.