You can buy tickets to the Polo games in advance, or just drive up and purchase at the gate. Don't worry about not having a "group" to tailgate with you; the four of you will have fun -- just pack some good food and drinks, bring chairs or a blanket, or sit in your cart. Also, the stadium has a restaurant and full bar.
Here is a link to the box office and it has the dates of the games:
https://www.thevillages.net/boxoffice/