[Lil' Lavery]

Any investigation where you're trying to get an image of FIRST as a whole REQUIRES a trip to a Mid-West competition. Given the events you've already decided upon, the best remaining choice would be West Michigan in Week 5. Some of the 55 teams competing at WMR are 27, 33, 47, 67, 68, 70, 71, 111, 245, 383 (all the way from Brazil), 469, 494, 703 and 1018. Of those there are three Hall of Fame teams (47, 67, and 111), and the only team to win more than one Championship (71, who has won 4).
That leaves Week 4 up for decision. Well, you already have 3 competitions in the East, one in the Midwest, so Week 4 should mean either an expedition out West (to San Diego), or North of the border to Waterloo. In Waterloo you'll get to see 28 teams, including 68, 188, 1114, 1241, and 1305. In San Diego you'll see 45, including 330, 812, 842, 968, and 980.
Also, if you're not finished with your dose of FIRST after Chesapeake, NYC is run from Friday-Sunday, so you could make the trek up to the Big Apple to watch the finals of the New York City Regional.