It sounds like you are looking for commercial product contests for the food business, not BBQ contests. There are plenty of such events sponsored by state government, industry associations, ag extensions etc.
As an organizer of BBQ Contest events, I can tell you that there is nothing I would rather NOT have at an event than an open sauce contest where bottles are shipped in from far and wide. There is nothing in it for the sponsors or participants at the festival and the logistics of doing such a thing at a festival would be a nightmare.
