I think today's practice was the only one that's going to be held in the stadium, right? I hope. The stadium felt so impersonal, where the practice field is very close to the players.
Not sure, but I would suspect you are right - I think it was held in the stadium since it was the opening practice and they had all the other festivities going on.
I liked having it in the stadium because everything was more compressed then when they are spread out across the practice fields, but I agree that it has less of a personal feel.