I haven't heard of any dates yet, but its usually at the end of March, you might want to contact Todd Skinner to see(email on Barnesville site), he will usually run a little article in the local news papers (Wheeling's WV, and Ohio's) .
I do know the OVGPG on Feb 13th will be the Beginners Seminar and on March 20th is the Advanced Seminar, both are great seminars to attend and they are given by the best growers in the world .
You will really like all the growers there Treetop, all are very helpful and will make sure you get off to a great start. Its only a little over 1 hr drive from where your at.
Another seminar is in Chillicothe (sogpg) February 7th, its a little further drive though, takes me almost 3 hrs to get there ,give or take a few minutes.