The Giants will play in a field fully saturated with Wi-Fi, free to fans during 2004: SBC makes it count at home by combining their expensive naming rights to the Giants ballpark in San Francisco with its new FreedomLink Wi-Fi service. The park has 121 access points, and SBC is offering free service for 2004. Nortel is involved in the deployment, while Intel has verified the location for its Centrino branding.
While the press release (not yet available online) explains that there will be some interactive games, day-of-game stats, and local information available through the service, this is hardly cutting-edge interactivity. Instant messaging rooms, live video playback of special angles (available only in the suites apparently), and other person-to-person communication could add even more to the experience.
If you want to increase people's engagement, don't push at them, but provide them more ways to talk to each other.