There are limited dorm/hostel rooms available at State Fair Park for about $100/room/night and they sleep 6 people (you have to arrange the group yourself as SFP only rents the rooms as a unit.) Requests for booking the dorms must be submitted to email@example.com by Sept 1st, 2017. Sites like couchsurfing.com and airbnb may also have rooms available that are near State Fair Park.
The Wisconsin State Fair Grounds has a list of hotels nearby.
There are about 70 full service sites, 30 additional electric only sites, and more dry sites at the State Fair Grounds. Maker Faire will not be a “Special Event” for pricing purposes (lower prices.) Water/Sewer/Electric plots are $40/night and Electric only is $35/night. For more information: visit the RV park web site. To make a reservation call 414-266-7035.
These amenities will be available inside the Wisconsin Expo Center.