I note from the start lists (hey, by the way---thanks for the great collection of data on the Regionals on the homepage!) that the NCAA has followed USATF's lead and "seeded" the flights in the field events.
I remember TFN bitching last year after the NCAA shot because there were four 70-footers in the field and instead of being in the same flight they were split two and two.
For the Regionals, they're grouped and split by Q marks. Also interesting that rather than have even numbers of competitors in the flights, they've apparently worked backwards, making sure the last flight is "full" and the first one has the dregs. e.g., the Midwest women's javelin has 7, 11 and 12 throwers in the three flights (12 being the 12 best).
So if you get to the meet a few minutes late for your favorite jump/throw, you're not really going to miss much. Even better, if form holds true, there will be a far more natural segue from the first three rounds to the last three, with virtually all the performers almost surely coming from the final flight.