PHILADELPHIA — The buzz at the start was for Allen Iverson’s ceremonial return.

By the end, more than 20,000 fans were on their feet and going wild for Jrue Holiday, Elton Brand, Andre Iguodala and the rugged-and-determined play that kept the eighth-seeded Philadelphia 76ers alive for at least one more game.

Yes, the Sixers are talking about Game 7 — and they’re taking this improbable postseason run back to Boston.

Holiday scored 20 points, and Brand had 13 points and 10 rebounds to lead the Sixers to an 82-75 victory over the Celtics on Wednesday night that tied the Eastern Conference semifinals.

No team has won consecutive games in a series where neither team has played well enough to seize control. But the Sixers were good enough to win Game 6, improving to 5-0 this postseason in games following a loss.

“Game 7,” coach Doug Collins said. “That’s all we wanted was to win tonight and give ourselves a chance to go into Boston and see what happens on Saturday.”

Paul Pierce, Kevin Garnett, Ray Allen and Rajon Rondo could be playing their last game together Saturday night if they can’t find a way to hang onto the ball and put away a Sixers team that won’t quit.

Boston has learned three times already how difficult that can be.

The fun started when the not-quite retired Iverson earned a roaring standing ovation when he presented the game ball.