After some consideration, we'd suggest that this would probably be best managed through a "pinned topic" in the Meditation forum.
If you wish, start up a topic outlining some of the centres and retreat info you have that will kick us of, and then a staff member will "pin" the topic, so that it appears in the Announcements section of the Meditation (General) forum, rather than just being in Topics.
If over time this isn't sufficient, we'll consider a separate sub-forum, but for now I think this approach will be sufficient.
"Do not force others, including children, by any means whatsoever, to adopt your views, whether by authority, threat, money, propaganda, or even education." - Ven. Thich Nhat Hanh
"Whether I were to preach in brief, Sāriputta, or whether I were to preach in detail, Sāriputta, or whether I were to preach both in brief or in detail, Sāriputta, rare are those who understand." (A I 333, Sāriputtasutta)