Jukola is the annual orienteering competition in Finland during a mid-June Finnish summer night and it's pretty much the best sports thing in the world.
Thousands of participants, everyone from the top of the world to people who go to forest once a year if even that, compete in the same relay competition.
The start, as pictured in the screencap below, is so beautiful. Almost 2000 athletes with headlights start to run into the forest.
I've had the pleasure of being there in-person twice.

