Go Skateboarding Day is coming up! June 21st is the date. For one day, Skateboarders take over the world! Imagine 20 million plus skateboarders riding at the same time. If skateboarders have their way, that will be the scene on the first day of summer: Go Skateboarding Day. Above all else, it's a day for skateboarders to skate. It's also an opportunity for those who have never been on a skateboard to grab a friend and join in. The grind heard around the world.