I went to Siyum HaShas there. Usually MetLife Stadium has kosher stands but they weren't open during Siyum HaShas. I guess the Haredim in charge who usually don't go to football games thought it wasn't kosher enough. Instead the regular food stands just had kosher snack food from Frum companies based in Lakewood and drinks. There was no serious food available such as meat sandwiches. I think I got some tortilla chips there.
Most East Coast stadiums have kosher stands. New York, Baltimore, and Washington baseball stadiums all have kosher stands. In Philadelphia, they only have a kosher stand at Jewish Heritage Night. In Philadelphia, only the football stadium has kosher food all the time. In Washington, I got shawarma. I was surprised to see that they actually had a non-kosher falafel and shawarma stand in addition to falafel and shawarma at the one kosher stand. I also got kosher food at the Prudential Center in Newark when I went to a hockey game.
Baltimore was the first stadium to have kosher food. Philadelphia is the only major city with a significant Jewish population without a permanent kosher stand at baseball games. So I can get kosher food when I sees the Phillies on the road but only at home during Jewish Heritage Night. Jewish Heritage Night is mostly Federation nonsense. The only good part is that you can get kosher food.