There are a few different groups around the area. Most of them that I know of have their own forums that they communicate on. Reef Central is the better place to communicate as this is widely known.
This would be a good place to start. Where you live may help determine which club you would associate with. I live in Thief River Falls and usually post in this forum, the Greater Minnesota Reef Society. There are members from the northern part of the state mostly. One of the members will have to provide a link to their little hideaway where they congregate. Myself, I research here on RC as it is a central place to meet.
There is also the Red River Valley Aquarium Club (LINK) which draws people from Grand Forks and Fargo, North Dakota. It's a one hour drive from my house. They have their own little forum too where they chat. One of their members will have to provide a link to it.
There is also the Twin Cities Marine Aquarist Society (LINK ) which draws people from the Twin Cities and surrounding towns.