"Packers advise season ticket holders to prepare for fewer or no fans at Lambeau Field for 2020 season" according to the Milwaukee Journal Sentinel.
Personally very disappointing (seeing a game at Lambeau is on my bucket list) since this was being planned as a huge family event for us with my roots in Wisconsin with ND grads and Wisconsin grads (as well as many relatives in Wisconsin who are great at tailgating) scattered about the family.