You won't feel so alone when there are familiar faces around. A business sponsoring a team can keep its name in front of the public by having its name incorporated into the team name, or printed on the team equipment. This gives both the team and sponsor a boost. Park together and hang out your banner. Your stable area should be sufficiently organized so everyone can find things.
Some teams bring flowers and other decorations.
Some set up a hospitality table or tailgate with hot or cold drinks and goodies. You can meet some really nice folks at a big competition, and it's always interesting to compare notes with people from other areas. Also be friendly to volunteer workers. These people are going to a lot of trouble to make a great show for you to ride in. Show your appreciation.