The shows are usually listed on the IBC website in the top right corner. www.ibcbettas.org
is the site.
However I'm not sure if the fall show schedule is up to date or not. Doesn't seem like there are going to be many shows this fall.
I DID just find out that next year's convention is going to be in Jacksonville, FL and I'm so excited because that's only an hour away from me
Convention is usually the biggest show of the season... it's every June and the location changes each year. This past convention was in San Francisco.