There have been pstings about some of these in the Industry Info forum under Cookoffs, Contests and Events.
The Hot Pepper
pileiton
SeeYouJimmy
Redback Chilli Co. in Jindivick has had one for years but 2010 was the last one at their current property (which is up for sale). They are looking for a venue for next year. Check out http://www.hsfff.com/hsffmain.htm