hi ahchungma,
I don't know any private teachers to lead a playgroup. In my mandarin playgroup one of the mom's she took the lead and other mothers would help her everyweek. I personally think if we get a group we don't necessarily need to have a teacher but set a schedule for 45 minutes and follow it. So, story time a mom who is good at reading with alot of expression can read, then the rest of the time we sing and play and dance with them.
Anyone in the area want to start/join an informal playgroup?