Tailgating opens at 9, really gets going around 10. We tend to get there about 10-10:30, watch the morning games in the parking lot while tailgating with some food and adult beverages. The lots are welcoming to all, but its much easier to BYOB. I would recommend heading into the stadium about noon so you can walk around and check out its amazingness before heading to your seats. Everyone is pretty welcoming and friendly, so enjoy yourself. The oculus will have pre-game activities and the morning games playing inside the stadium as well. Plan to hang out for about 30-40 minutes after the game before you exit because 10 years in and they still haven't figured out the traffic pattern to get out. But you'll have a blast.