SAN MATEO – With the auditorium at the Peninsula Golf and Country Club split half-and-half between Cal and Stanford supporters and peppered with football royalty, the general managers of the rival schools’ football teams had a message of unity on Wednesday night.

“We believe in each other, because we need one another to exist.” Cal’s Ron Rivera said.

Rivera and Stanford’s Andrew Luck sat a few feet apart from one another in a panel moderated by ESPN’s Mina Kimes and attended by NFL commissioner Roger Goodell, 49ers GM John Lynch, former Raiders executive Amy Trask and 49ers Hall of Fame quarterback Steve Young. The proceeds from tickets went to the Women’s Coaching Alliance , a Bay Area non-profit organization that aims to use youth sports to develop female leaders.

Both Luck and

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