1) Not many bbq competition in CT or the surrounding areas have a backyard category, if I enter a competition in the pro category one time can I enter in the backyard in another?
The “backyard” and “pro” designations are really just labels as opposed to true sanctioned ranks. If you are competing in a “pro” competition, you are a “pro” that day. If you compete in a “backyard” competition, you are a “backyarder” that day. There are no rules that prohibit you from competing in the types of competitions you want, when and where you want, under the sanctioning body you want.
2) Part 2 of that question is, If an event is a non- sanctioned bbq contest vs a KCBS contest will that effect status?
Again, there is no actual “status”.
3) I have always made my own rubs and would like to purchase some. Where do most people buy rubs?
I can’t speak for “most” people, but Hawgeyes BBQ is a very popular source. Of course, a lot of competitors and backyarders make their own.
I hope this helps,