The Celtics’ Jayson Tatum, Jaylen Brown enjoying their All-Star moment

OAKLAND — Jayson Tatum and Jaylen Brown are in the middle of their sparkling NBA careers, yet they find themselves on Shaquille O’Neal’s “OGs” All-Star team, joined by several future Hall of Famers as this new All-Star tournament begins Sunday at Chase Center.

The “OG” will face the Rising Stars and Kenny Smith’s “Young Stars” will face off against Charles Barkley’s “Global Stars” as the NBA tries desperately to resuscitate the All-Star format with a four-team tournament the league hopes will motivate the game’s greatest stars to be at least competitive.

But what the reality the NBA cannot deny is that All-Star Weekend has turned into more of a league convention, with players bringing their families, making marketing appearances, hanging out with other All-Stars and taking photos with league legends. The game itself has taken a backseat to the rest of the eventful weekend.

Said Tatum when asked if he would change the format again: “I don’t know. I guess we’re going to see [Sunday].”

Tatum and Brown are here once again and while their agendas are different, they enjoy the experience and said they are grateful for the opportunity.

During All-Star practice at Oakland Arena, Tatum mostly supervised his son, Deuce, who was working up a sweat shooting baskets and playing one-on-one with his dad’s All-Star teammates. Deuce recently turned 7 and he’s now old enough to remember these moments with Dad, which has made Tatum cherish these All-Star appearances even more.

“All-Star is always cool but it’s probably going to get even cooler now that he’s at the age where he’ll be able to remember it and enjoy it a lot more,” Tatum said. “He was actually looking forward to coming here this weekend. We’re just at that point in his life where we’re starting to enjoy basketball and fall in love with it and these moments are about you but they’re about your family and friends and the memories you can create.”

Brown came to Oakland with a business agenda, meeting with city leaders and on Friday announcing his plan to promote Black-owned businesses in Oakland, similar to the plan he is working to implement in Boston.

It’s a homecoming for Brown, who played one season at Cal and considers Oakland/Berkeley a place of comfort and familiarity.

“It’s special because I went to college here, I’ve got a lot of family and friends here,” Brown said. “I think that’s what makes it special for me.”

In recent weeks, Brown called himself one of the team’s captains, although that title has not been officially anointed. He explained his stance on being one of the team leaders, embracing that role along with Tatum, who was sitting about 60 feet away conducting his media session.

All-Star Weekend has been a homecoming of sorts for the Celtics’ Jaylen Brown, who went to Cal-Berkeley for a year.Thearon W. Henderson/Getty Images

“One, I’m the longest tenured Celtic,” he said. “I’ve been here the longest. Even though we don’t necessarily have it written down, the team moves to the things that me and Jayson do. Even though we have a lot of great players, I feel like my team relies on me to be the leader, the vocal leader and I’m taking that role. Defensively, being the head of the snake, taking on those matchups. My team feeds off of that. It’s kind of like understood but I look forward to those, especially in the playoffs, you’ll see it a lot more.”

While the Celtics ended the unofficial first half playing some of their best basketball of the season — with wins at Cleveland and New York — the first 55 games have been a roller coaster, with the team beginning 19-4 and then 13-11 before winning seven of the final eight games.

Brown acknowledged this season has been different. They are taking the best shots from opponents on a nightly basis. They haven’t been as consistent, especially on defense. But they are still the No. 2 seed in the East with a chance to catch first-place Cleveland with a hot finish.

“It’s changed and it’s OK,” Brown said. “We just embrace it, to get ready for the playoffs. It’s been a fun journey but it’s changed … people look at change like it’s supposed to be the same all the time. It’s a new year, new season, new team, everything is different and it’s OK. We’re going to adjust and we’re gearing up and getting ready for the playoffs.”

Tatum and Brown realize there’s only a short time to cherish this break before the grind begins again. Tatum joked during practice that he’s not an “OG” yet despite being on a team filled with 30-somethings. With 20-year-old Victor Wembanyama a first-time All-Star and six years Tatum’s junior, time is passing fast for the Celtics superstar and he understands these moments are sacred and don’t last forever.

“I’m still young but eight years in the league, played a lot of basketball, a lot of playoff games,” he said. “But I’m in the middle. I’m not one of the old heads but getting to the point where some of the younger guys look up to me, probably watched me in high school. It’s a smooth transition.”