The Holleder Center is at the stadium. They will have shuttle busses. The parade is long after the briefing which will all be over in late afternoon.
You don't really get to watch them form up for the parade, you want to be over at trophy point while they are forming up anyway.
The Superintendent briefing was about 2 ish (can't remember exact time) in Ike then the parents would walk over. If the afternoon briefing is in the Holleder center, I would think they would have shuttle buses over to trophy point.
They will give you time to move.
In the morning there will be a bunch of tables with information. One of these is the Post office and you can pick up a card with your New Cadet's PO Box AND Company. This is how you will know what company he is in. This is crucial for attempting to find him in the parade. The males - unless they are black or asian - all tend to look alike. Mothers - you only think you know your son!
Females are easier to find but can be difficult too. Females with short hair are the easiest to find. If you leave unable to locate your son/daughter do not despair. By the time you get home there will be a video up and you can spend 6 hours going back and forth finding your New Cadet!
Tip: After the parade, go sit in the bleachers for the parade field with a zoom lens, or walk around the parade field toward Washington Hall. The New Cadets will march around the parade field and into Washington Hall. Wait for the very end if you can - you can see them march in for dinner and the door will slam. Even the most stoic parents wipe away a tear.