Flight
Appleton (ATW) is very close if you're going to be visiting from out of town on a tight timeline, however, Milwaukee (MKE) and Green Bay (GRB) offer the most flights.
Hotel
There are several hotels in Oshkosh, but we have arranged a group at one. Quick link: https://hiltongardeninn.hilton.com/en/gi/groups/personalized/O/OSHGIGI-CWWRO-20190426/index.jhtml?WT.mc_id=POG
Discount Code - CWWRO