Psyducky, Keep watching the pokemon.com site. They post the events at ToysRUs (which in my area have lately been pretty lame). I am going to try the next one, since at the last one the poor guy they had running things didn't know how to make the wireless work
There was an event in your area earlier this year that I missed
You can sign up for an email newsletter (warning: loads'o graphics) at nintendo.com or pokemon-games.com and that also annouces most events. I think watching pokemon.com has been more consistant for me, even though I get the emails.
We try to get down that way every so often (mostly in spring/summer). I'm in the Des Moines area, and we have relatives in Hannibal and St. Louis.