Childrens well-being groups in Pitshanger park

Hi there,
I wonder if members might be able to provide me with some advice? I am an occupational therapist living in Ealing and would like to run a couple of well-being sessions in the park for children working with clay (hand build pottery) and mindfulness/ meditation. Would anyone happen to know if there is any policy around running community groups in the park and also any children that might want to participate?? The sessions would be free, just a donation to cover the cost of clay.
Look forward to hearing back
Vicky :-)