rainbowgatherings.org has a Mid-west Rainbow Gathering group . some focalizing seems to happen there .
quite a few regionals in mid-west every year. KY, illinios, indiana.. what part you looking for? great link above ^^
Indiana here. for now... I am lookin to get out to some gatherings again this year. Last year I first found out about the rainbow and was very lucky to meet many a brother and sister. I had a blast and want to thank all involved. I heard about the Kentucky one last year but did not get to make it, maybe this year!