Midwest Mopars in the Park - Farmington Mn.

Looking at Google Maps Satellite view in the area. These hotels look to have good parking as well.

Stillwater Hotels (less than 2 miles to the fairground)
AmericInn by Wyndham
Comfort Inn (might be called Lexington Inn & Suites of Stillwater-Minneapolis now)
Asteria Inn & Suites - Stillwater/St Paul

Hudson, WI Hotels (about 10-15 miles from the fairgrounds)
Comfort Suites

Woodbury (about 10 miles to the fair grounds)
Extended Stay America
Holiday Inn Express and Suites (off of Manning Ave)
Holiday Inn Express and Suites (mentioned above)
Hilton Garden
Courtyard by Marriott
Residence Inn by Marriott (mentioned above)
Best Western Regency Plaza (St. Paul East)