A few ideas from some of Gunn's sports teams:
1) Organize a potluck in conjuction with the beginning of season coaches meeting, with additional get-togthers during the season. Getting to know other team parents at well as the kids before the end of the season party makes the season more enjoyable.
2) The most successful teams work together, that is, Frosh/Soph, JV, and Varsity socialize and fundraise together.
3) Create Team Lineup Cards (sample team lineup card) to help parents get to know each other as well as the players.