Boston's exhibition slate is set: at Cleveland on October 8, then Philadelphia twice, on October 10 and October 16, with Charlotte sandwiched between on October 14. The regular-season opener follows on October 20 at Detroit, airing on NBC and Peacock.

Philadelphia appears twice before either game counts.
Boston hosts the 76ers on October 10 and visits them on October 16 — the team that eliminated the Celtics in the first round last spring after a 3-1 series lead. Paul George, acquired from Philadelphia this summer in the trade that sent Jaylen Brown the other way, faces his former team in both.
The full exhibition slate now has four fixed dates.
Cleveland opens it on October 8, Charlotte follows at home on October 14, and the second Philadelphia game closes it out on October 16. Four days later, the actual opener tips at Detroit, on October 20.
Tatum's own clock runs ahead of the exhibition calendar.
He remains without a firm timeline, listed with a left knee issue, but his target is October 1 — a full week before the preseason opener in Cleveland. If that holds, camp will have him back before a single exhibition game is played.
One roster spot remains open, and unclaimed.
A two-way contract has sat vacant since a September 12 report flagged it, with no candidate named since. Caleb Grill filled a training-camp deal on September 14 and left the day after; the camp group now numbers twenty, built around Tatum, George, Derrick White and the returners from last season's 56-26 group.
When do the Celtics open the regular season?
October 20, on the road against the Pistons, with the game airing on NBC and Peacock.
Will Jayson Tatum be ready for the preseason opener?
His own target date, October 1, comes before the preseason opener on October 8, but Boston has not confirmed a firm return; he is still listed with a left knee issue.
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