I checked which restaurants would take a large group on Tuesday and one is Fox River Brewing. For people that don't know it, it's a large beer garden next to the river. Good beer and food.
Would people be able to get to it? It's 10 min / 5.3 miles from the main gate.
We have a car and can take 3 along.
/Martin
For transportation, see this link. Uber/Lyft rides can be picked up at 4 places. One is right next to Homebuilt Camping / Hangar C marked as U/L on the map
One of the suitable shuttle buses is going forth and back to the dorms (Between Main Gate and Gruenhagen Conference Center, 208 Osceola St, Oshkosh, WI 54901). From the dorms, it's a 23 min walk. The bus leaves the main gate on the full and half hour.