As Capt MJ said, parking at the stadium is easy. Parking lot is right next to the buses and they run regularly. You and whoever is with you will have to go through security before boarding the bus and there could be a bit of a line there, but no big deal. Once the bus drops you off at the Yard you could end up in a long line waiting to get to Alumni Hall. Don't sweat it if you are still in line when your report time hits. I forget DD's report time on her I-Day, but we ended up in a long line that took quite a while. We and DD were a little worried about her getting in trouble for being late for her report time due to the wait. One of the chaplains was cruising up and down the line greeting people and he assured us that she was fine. He also offered to take a photo of us in front of Alumni Hall. They know the level of nervousness of Plebes-to-be (and parents) and know exactly what to say.