Sail Isegran is an annual traditional sailing event which takes place during Pentecost weekend. Sail Isegran starts on Saturday with a sailing and rowing race for small traditional boats. Up to 30 boats participate and sail a 10 nautical mile race around the island of Kråkerøy, starting and finishing on Isegran. The race for larger vessels takes place on Sunday in the open waters outside Fredrikstad. There is a class for classic yachts and a class for gaff-rigged vessels with up to 40 boats participating. On Sunday evening the crews, owners and other guests gather in “The Boathouse” for the prize-giving ceremony and social gathering.