How about a new forum titled, something like, "Big Rides-Info and Schedules".
I always see that a major (or moderate) ride has occurred by seeing the pictures posted after they have happened. RAGBRAI, The Katy Trail ride, the Great Frozen Recumbent Snowshoe Jackrabbit Chase Accross Alaska ride (tm ), charity rides, etc, could be posted here.
If people wanted to talk about the rides, they would have to put the comments elsewhere. this would only be for announcements and schedules of rides, nation wide.