Although I wasn't asked this question, I would like to piggyback on what Tim said. I have been to a few, and each one does give you something new and exciting. For the first time I decided to attend the FGS Conference in Springfield, Il. Didn't have a clue what it was about, but I always heard about it. They had classes from 8am to 4:30 pm. Some people were going to classes every hour for 2 days. One lady was a newby. She had her sandwiches and snacks in her Bag so she would not miss anything. She was so pumped up and excited.
I picked a couple of classes that I thought was about something else. BUT you know what, it happened to be one, that explained what a society that host conference must pay out, how it should be organized and how to get people interested to come in order to make it grow. (Tony Burroughs and Tim Pinnick were presenters at this conference. I especially wanted to go to their classes because they both always speak on something new about researching.) I didn't know how difficult it was to host a workshop. I gained a lot more respect for the people who do this.
I suggest not worrying about IF a conference is about the state you are researching. The presenters always have more to give about Afro American Research. I attended one of Tim Pinnicks classes, sponsored by the Afro American Historical and Genealogy Society-DC. Tim taught about research information that could be found in University Libraries. I never knew that. I rushed right home and was amazed at what our University had to offer and I wasn't even a student. If you can, go to a 2 day conference. If there is a 1 day workshop, that will work also. Networking--that's what it's all about. EACH ONE DOES TEACH EACH ONE