It feels more like a party than a hockey game. In Boston’s sold-out TD Garden, lit like a constellation of stars and pulsing with a DJ’s beat, the jumbotron camera zooms in on faces in the crowd. A pair of women with trim white hair and oversize jerseys grin and pump their fists. A mother gleefully hoists her baby. A silver-bearded man winks from beneath a captain hat. Girls’ youth sports teams dance. Fathers high-five their sons. This is not an NHL game or a playoff game. It’s a regular-season game of the Professional Women’s Hockey League (PWHL), founded in 2023. On this night, the Boston Fleet are taking on their rivals from Canada, the Montreal Victoire, in front of a raucous record-setting hometown crowd. Why We Wrote This The business of women’s professional sports is booming, thanks in part to female venture capitalists investing for the long haul. Women’s pro sports have had joyous moments like this before.…