The midnight sun run has taken place in Laugardalur valley in Reykjavik close to Midsummer or summer solstice since 1993.
Upcoming races are:
2019 Suzuki Midnight Sun Run - Thursday evening June 20th
2020 Suzuki Midnight Sun Run - Thursday evening June 25th
Registration for the 2019 race will start on January 11th 2019. Information about entry fee, program, etc. will be available here at midnightrun.is at the beginning of January 2019.