For almost 10 years now, I have been administering and moderating a forum, much like TOTV. It is free and has been very reliable. I do kick in a couple bucks a year to get rid of the ads. You can make it as private or as public as you wish. You can even restrict access to just sections of the forum.
If any group is considering creating their own community forum, I'd be willing to talk to you about my experiences.
I use
InvisionFree.