I have a mask similar to that I've been wearing daily as I walk on my lunch hour and it has been cold, also use it when cross country skiing. It only goes up over the ears and velco's behind the head. It works very well for keeping the cold off the nose, ear and cheeks. Bring a cloth though. These masks also keep moisture in a cloth to wipe that moisture off the cheeks, nose and mouth is helpful.
Socks/Boots - Wear two pairs of socks. 1 liner sock should be thin (Fleetfarm or sporting goods store should have them, with wool/wool blend over them. The liner sock should wick moisture away from the skin. And make sure the boots are not tight with the additional socks bigger is better. There must be some air space for the body to heat up to help keep warm.
Long undies and pant. Also make sure the pants are lose over the long johns. No skinny jeans. Again air space for the body to warm up.
Hand - Mittens are good, but I find when hunting that the hand warmer pouches work even better. For me being able to have both hands in one insulated space I am able to keep them warm better.
Getting to the stadium. Wear as little as possible getting to the stadium. Nothing will make a person cold faster than breaking a sweat walking and then sitting in the cold. If you can carry a couple layers with you and throw them on once you get inside, do it.
The world needs ditch diggers too Danny!!!