Here is the organizer Stäkets SF's invitation with important information:
https://distriktetstockholm.se/onewebmedia/Dmg%C3%A4ddainbjudan2022_rev_1.pdf

See the sport fishermen's rules branch pike. https://www.sportfiskarna.se/portals/sportfiskarna/Regler%20Gadda%2020211202.pdf