wonder why noone said midwest cities.
Cincinnati, OH during the Oktoberfest - the largest in the US, and 2nd largest in the world after the one in Munchen ( google it). Also spectacular views of the city downtown + some nice museums
Dayton, OH during their air show, plus the largest air museum, makes the Udvar one in IAD look super tiny. OK downtown
Indianapolis, IN and Columbus, OH - some nice things to see there as well, OSU + the race track, a lot of history.