Parents are always welcome and invited to stay to support their child and on occasion participate in the activities.  This is not correct because if we do it within a nursery environment we would need to check with them. Can I suggest saying as long as the establishment is happy with it then so are we.

For community setting sessions parents are always welcome and invited to stay to support their child and on occasion participate in the activities. During nursery/pre-school sessions its not necessary to stay..