Play dates for Children (concord / pleasant hill / martinez)

Seeking a peaceful environment that is hosted by friendly parents who are willing to welcome other children to engage in play with their children to allow socialization skills while making friends at the same time.
We are located in Pleasant Hill.
My children's ages are 7, 6, 2.
They enjoy drawing, building with Legos, and playing tag.
Availability for play dates are Friday, Saturday, Sunday from 7:30am to 12pm.