Mid West was the first week last year, but the University of Illinois at Chicago women's basketball team has regular season games on March 4th and 6th and possible tournament games on March 8, 10, 12, 14. So the earliest Mid West could be is Week 3. With only 5 weeks some may be hard pressed to have two weeks in between regionals.
Also the SC state Lego competition is March 6, so that makes any one in SC that mentors a Lego team in conflict with neighboring GA's Peachtree regional.