"I don't see why they are making it public."
That's a no brainer. Attendees should have the choice of going or staying at home. I would not take a grandchild to one of those games. I might go alone.
According to the article I posted in #200, the threat was discovered October 12. Since today is Oct. 18, the Feds are not taking it public. It seems that when alerting the stadiums, word got out.