http://www.usabjjtournaments.com/
Talk to some of the other local schools see what tourneys they are going to.. when you start going to unsanctioned tournaments.. sometimes the rules get "sketchey"....
I went to an open tournament once.. (karate)... got KTFO'ed with a roundhouse to the face...Of course the guy was DQ'ed... but that didn't make my face stop hurting...
Just be careful with where you compete and see who the governing body is.