For travelers by bus from Stockholm: There is several options for traveling to the festival. Buses goes frequently between Stockholm and Norrtälje. If you are planning to take the bus from Stockholm, the buss 676 leaving from Tekniska Högskolan to Norrtälje busstation. The festivals schedule is adjusted to the buses departure from Norrtälje, you will be able to take the bus back to Stockholm after the festivals ending. The festival is located in the outskirts of the town, but still in the central parts. You can easily walk from the busstation, a walk of possible 20 minutes.
The bus company: https://sl.se/en.
Visitors by plane: For visitors from abroad it’s possible to go by bus directly from Arlanda airport to Norrtälje busstation with UL 806 and bus 677 (make sure to buy tickets before you entering the buses or have your bus card filled, the buses are from two different bus companies). You can buy the tickets for the buses at the airport. Take bus 806 from Arlanda to Åby-Långhundra, there you change to bus 677 to Norrtälje busstation. Even though the buses are from two different bus companies they are coordinated for this route.
For calculating your route, visit: https://www.ul.se/en
Visitors by own boat: Since Norrtälje is located next to the water, it is possible to visit by using your own boat. The guest harbor lies next to the festival area.
For more info see: http://www.upplevroslagen.se/gasthamn-norrtalje/