In the event square at Yoyogi Park, snow will be trucked in and a slope with a rail down the middle for snowboarders constructed.
The event apparently has the dual purposes of increasing interest in snowboarding and raising awareness of becoming a bone marrow donor.
The event runs from 10am until 5pm. Closest stations are Harajuku/Meijijingumae on the JR, Chiyoda and Fukutoshin lines and Yoyogi Koen on the Chiyoda Line.
To prevent the spread of COVID-19, many events have been canceled. Always check official sites before heading to an event.