BOSTON — The Northeastern University graduation Friday will make the TD Garden unavailable to the Bruins, so they practiced today on their home ice in place of a morning skate before tomorrow’s Game 4 of the Eastern Conference semifinal series with Philadelphia.

Adam McQuaid (sprained neck) and Zdeno Chara (rest day) were the only players not on the ice for the Bruins, who were joined for the first time in the postseason by rookie Steven Kampfer (recovering from a knee injury).

The Bruins were exercising their minds as much as their legs, as they worked to get their attitudes ready for a potential closeout game tomorrow night.

“We’re feeling good, obviously,” said forward Nathan Horton. “It’s nice to be up three games. But the job’s not done yet. We all know that. It’s not over until it’s over and we’ve still got a lot of work in front of us.”