Have you hard of the Southern Baptist Convention? It is a Christian denomination based in the United States.
Yes, I have, but have never attended one. 
I have attended many, We baptists generally recognize two ordinances, baptism and the Lord's supper. That is our belief. 
Do they hold the convention at the same location every year?
I believe so yes, I know that Since the 1940s, the Convention has shifted from some of its regional and historical identification quite a bit though.