The map source is based off of FiberglassRV rally postings, although a few rallies are posted from other sources (and no further link information is available if it doesn't come from FiberglassRV). I can't chase down numerous sources all the time, especially not from FaceBook.
RV Compass has a link to the rally map, but the mailing list for new rallies are just for the events RV Compass hosts/manages.
...Although, you just gave me an idea and I'll have to take a look on how difficult/complicated it would be for me to send out a scheduled email on ANY new fiberglass rallies...huuummm.
Let me think about that.