The event was open for children of all ages, from 3 to 12 years old, to educate the children on how to train the body with a limb defect, learn precautions when running, and learn how to manage artificial limbs. So the Seminars were carried out by physiotherapists, prosthetists, and orthotists to teach children and families the importance of age-appropriate exercise, support children's growth, and long-term children's prosthetic limbs and stump management.
Subsequently, the Paralympic World Championship medalists Heinrich Popov, Leon Schaefer, and Atsushi Yamamoto had the chance to run with the children and play a tag game tournament on a wide ground. The children felt the joy of participating with a Paralympic gold medalist.

See below for the Japanese version.
http://www.sftlegacy.jpnsport.go.jp/wp/jp/20180613-1/