Why not the events page?
I like the "events", page when things are current. What happens when the event is pulled down? Its a shame to remove them after an event (yet, we need to have some way of keeping the event pages clean.) But once pulled down, the information contained is lost (unless you know who to email to get an old copy!) Lastly, to get an event posted today, you have to find the right person. Using the discussion board would open this up.
Why not the general board?
The general site is so busy with so many postings, that I would be afraid of them getting buried. In many respects, the reason for separate topic based threads--is what our new tool allows. The general discussion is just that, wide open (both to members and non). Having a single topic thread around Events and Planning would by is use, create a historical (and current) view of CD Events.
Why members only?
Simple, there is an increase in spam (junk) [and off topic] postings in the general site. Having an event site limited to Members--would (I hope) keep the extra noise to a minium. I also feel it would benefit all by having a working place where we (as members) could post information about an upcoming trip, places to stop (or not), etc., all under the umbrella of an Event entry. It might also allow for folks to feel more comfortable posting contact information. We still can cross post to the general site the "Announcement", if need be.
In summary
I don't know if this is the right tool, or not. However (or whatever we use) creating a place where we can do event announcements and planning is needed. Having a place where we can keep a record of not only the announcement, but minutes, photos, etc. all about an event--would create a great historical view too.
Thank you for your time,

Pete