The San Francisco Giants will host an African-American heritage night in September. Those events have ranged from the infamous Disco Demolition Night once staged by the Chicago White Sox to the Mets' Jewish and Irish heritage nights. That most teams have chosen to stage a pride day or night at their ballparks is not surprising, because thematic promotions to draw fans have long been part of baseball's culture. But one team that has not done so is the New York Yankees, even though their city helped give birth to the modern gay rights movement.