The Celtics are up for sale and majority owner Wyc Grousbeck provided Himmelsbach with an update. “The sale process is gearing up and about to hit full speed,” he said. “It took this long for our advisers to go through the financial and business data of the team and our whole management team, and spend enough time to put together offering books. Now they’re beginning to have discussions with interested parties, and the bidding process will commence in the next month or so.”