The Pittsburgh Steelers to the best of my knowledge there the first, and to date only, team in the NFL to take any preliminary precautions regarding ticket sales in preparation for what might come down the line, agreeing to make only 50 percent of their tickets available at this current time in the event that attendance will be limited due to social distancing restrictions being required.
This is, I believe, more of a business approach than anything else. It’s easier to sell more tickets later than it is to have to take them back after already selling them and issuing refunds.