At the rally the crowds are to be enjoyed, not avoided. The grounds are large. During the day some will visit the vendors, some will be finding food among the food vendors or in town, many will be in seminars, some will lounge in camp, and some will still be in their hotels or out riding.
Since this is your first big BMW MOA Rally let me offer some words of wisdom gained from my 34 such rallies. You should go to the Ambassador Booth and get your #1 pin. This denotes you as a first timer. You might be termed a "rally virgin". This is all in good fun, but the pin serves a far better purpose. It lets anyone know that this is your first rally and you are to be welcomed and assisted in navigating the rally.
Over the years many people have written or said that they found the rally goers to be a bit "clicky" (sp?). It is to the extent that folks tend to hang with the people they know. But it is very rare that anybody intends to exclude newcomers. The #1 pin helps but you should feel welcome to introduce yourself and join in the fun. Don't go to a seminar and just sit down. Say "hi" to somebody. If camping, get to know your neighbors. And so forth.
If you have specific motorcycle related items in mind to purchase the vendor area will seem like the candy store to a little kid. Hopefully you have a bit of room on a credit card. UPS and/or FedEx will ship from the site if you just have to have that riding suit or new seat.

If you sit down with the program and check every seminar that interests you it will become clear that you don't have time to go to all of them. If you want to, sign up/show up early for a BMW demo ride. Slots fill fast.
Be sure to see the Vintage Bike display and the Bike Show display. They will provide a great overview of BMW throughout the years. And don't forget the music, which will be ongoing in the afternoons and evenings. And if so inclined don't miss the beer garden. Even if not beer inclined bring some water, tea, or a soda and enjoy the company of some of your fellow riders.