Summer camp/activities for kids near Machida?

My parents live in Machida, and my kids will be staying with them for 1-2 weeks (dates TBD – most likely in August). I am not a resident but hoping this post is still OK since my kids will be with residents.

Neither of my children speak Japanese (ages 4 and 7), and my oldest is low speaking autistic. Does anyone know any English speaking summer camps or good summer activities for these age groups? I plan to speak to them ahead of time to check accommodations.

by Capital_Minimum_7827