That's great Todd, but it can't hurt to think bigger.
Mike
www.google.com with search words "multihull regatta schedule". Very comprehensive result and took 5 seconds.
You might want to take a look at this site
http://www.regattadates.com/ if you still think we still need another source for regatta schedules.
The NE guys are doing it right IMO they embrased using social media as a tool to get the word out years ago. I also have a feeling they have tried or are curretly doing all the suggestions contained in this thread and could tell you what worked and what didn't.
There is no such thing as a one size fits all when it comes to putting on regatta's. Know your audiance, know who the spark plugs are and above all else listen to them and leverage their knowledge. These folks are dialed in to their fleet and often know which regattas their fleet members will attend and why. Find them and use them, ignore them or think you know better will only do a diservice to your regatta.