I'm afraid if they see it listed, they will feel left out or offended that moderators are meeting privately.
I think 9 out of 10 forums have private forums for moderators/admins.
We have 4 in total, talk about everyday moderation stuff, a seperate forum te handle all our e-mail communications, a forum for the techies and one special forum where each topic automaticly pops up in our
FAQ.