Authority???
I am reporting... there is no official bulletin board or forum used by the MHC.

Information is distributed from the Area Reps, Class One design mechanism, smoke signals and any other means that the anyone can think of.

Anything "official" is published on the USSA web site. That is the official repository of any work that the MHC would do. (minutes, recommendations etc)

There is NO BUDGET for the MHC....What it can do is make your voice heard via an official channel to USSA... (Olympic, handiciap, Safety)

For example, the multihull championship committee will be made official shortly, I suspect the information will be published on US Sailing. The MHC will be making their feelings known to the Championship committee (who have to go out and make an event happen).