The fine folks at Detroit Catholic Central usually host a tournament in Novi at least once a year. Additionally, if your school can make the short trip down I-75, Bowling Green State University is good for at least one tournament a year (they've already had one this fall, but they might in the spring).
Additionally, there are frequently tournaments run at the University of Michigan. NAQT.com (click the High School tab, then schedule) will give you a listing of tournaments using that company's questions, many of which are hosted in Michigan.
Best of luck!
Joe Galea, Assistant Coach, Olmsted Falls HS, Olmsted Falls, Ohio.
Detroit Catholic Central '02
University of Florida, BA
Case Western Reserve University School of Law, JD
2001 NAQT National Champions