I live in NE WIS, just south of Green Bay.

Couple of courses you might consider: Note the below two courses are north east of Erin Hills, closer to Lake Michigan.

THE BOG: Palmer designed course located in Saukville. We played the SR Best Ball at The Bog in July. Nice facility, like a number of holes. Lots of bunkering, several blind shots. Good value at $80.

THE BULL. Nicklaus designed course, beautiful layout, nice practice area. Located in Sheboygan Falls, just south of Kohler. Rates, $100 including cart. (Presuming you have considered the Kohler courses, much higher greens fees).

Two off course ideas close to The Bog and The Bull. 3 Sheeps Brewery, well know craft brewery located in Sheboygan.
Il Ritrovo, great restaurant also in Sheboygan.

Final course recommendation: SentryWorld Golf Course, located in Stevens Point, (125 miles from other courses).

Hosted the US SR OPEN in summer, 2023. Immaculate conditioning, all inclusive pricing, $325 includes, cart, food/drink on course. 20 minute intervals between tee times so it feels like you have the course to yourself.

If you play the BULL or The BOG, easy drive up 43 North to Green Bay for a Lambeau Field Tour.

Hope this helps. Brian

Lawsonia

Lawsonia ought to be first on your list.

The obvious would also be the Kohler courses.

Great courses in the Dells and accommodations for a group. Check out Trapper's Turn and Wild Rock. On the way from Erin Hills, you could stop at The Oaks (east of Madison) or University Ridge. Plenty of good golf all around Wisconsin. Safe travels.