There is also an awesome mtb camp in Waco, TX. I know you said Midwest, but I just had to mention this one.

It's usually the first weekend in November. Last year Shonny Vanlandingham came to help out. There are all sorts of skill levels.

Also, the city of Waco provides food, free camping and bikes (although they aren't very reliable.)

Specialized Women's Demo Tour also is on hand!

Keep an eye out on www.keepwacowacko.com or contact Bicycles Outback of Waco.