They're often willing to talk, or sign a scorecard, but they're trying to record the game and chart the pitches. I enjoy sitting with them. Some of them chatter about what they see on the field, which can be fascinating. The action doesn't stop between innings. Prizes are awarded.
Larger fans try to hit a baseball over a specific outfield sign, or toss a ball at a target.
Birthdays are celebrated. South Bend used to have cheerleaders dancing on the dugouts. Some of this is silly, and much of it's embarrassing. All in good fun. The Phillie Phanatic and the San Diego Chicken are famous, while some of the others are less so.