Planted Tank Enthusiast
Join Date: Aug 2006
Location: Cincinnati, Ohio
Greater Cincinnati Aquarium Society
Didn't see a thread about this, but if you're in the Cincinnati area, you can check out the Greater Cincinnati Aquarium society:
We have meetings once a month (generally, you can check the calendar) with a guest speaker who talks about something. Fish-related most of the time, but plant speakers have popped up from time to time.
There's a couple of loyal plant people lurking around too (somewhere!).
You can shoot me a PM if you need more info or check out the site.