OK, Please understand that I am not an expert, the following is "to the best of my knowledge", if some of these do not exist as identifiable cuisines, or are alternate names for others, please excuse. Sorry for the delay, I had problems logging on and then didn't see notifications there were responses to my post, etc. Since the original post, I have led the group to the BoodleBoodle at Bacolad and have another outing scheduled for this Sunday (nothing special, just to keep the momentum going).
While some popular types can be repeated, my goal is new when possible, for a dining group (subgroup of a Northern Illinois chapter of a worldwide society) of 15-30 that won't go to Milwaukee or Indiana, like some suggestions above were. There may be people in the larger group that would go there, but they aren't on the announcement list for anything I'd organize.
Some we've been to (when somebody else was organizing): Nepali (At Himalayan), Finnish (custom off menu dinner at Tre Kroner), Ethiopian, Eritrean, Nigerian, Peruvian, Afghan, "fancy" French (Le titi du Paris), Chinese, Greek, Malaysian, Georgian, Hungarian, Polish, Indian, Pakistani, Brazilian steakhouse, "the usual suspects" like Chinese, German, Irish, etc, and others the group went to that I missed.
I have personally been to one of the Yemeni restaurants, not ready to bring the group there, and probably should try the other.
Specifically seeking:
--regional Thai (NE Thai is the same as or similar to Hmong, also seacoast and mountain regions are identified as different in my Thai cookbook)
--regional Mexican, as maybe Mayan derived, etc
--Regional Japanese? (I know every area has their own speciality, but do any have enough specialities to make a whole meal, at least an affordable meal? Maybe at least Hokkaido?)
--Native (North) American (plains, others?)
--Peruvian serving guinea pigs
--"Peasant" French
--Brazilian native as well as other south American
--native New Zealand
--Pacific Islands?
--Other regional African?
--Regional Chinese (Sichuan, Hunan, Anhui, Fujian, Cantonese, Zhejiang, Jiangsu, Shandong) I am not aware of having had other than Sichuan, Hunan and Cantonese
--Regional Italian (one web page lists 20 regions, I am unaware of having had other than Sicilian and Northern as I think the typical Italian restaurant serves)
--Other regional varieties of what I think I know.
--Anything that would have qualified for the "Bizzarre Foods" TV series.
Carey
--Carey aka underdog