It had the sound and feel of October — with a summer concert twist.

Multiple ovations throughout the night. A live performance preceding the ninth inning. A lead-saving defensive play by Brandon Nimmo, and brilliant pitching from Jacob deGrom, Adam Ottavino and Edwin Diaz.

The Mets evened this three-game series and potential NLCS preview with the Dodgers, pulling out a 2-1 victory Wednesday behind seven near-flawless innings from deGrom. Diaz closed it out, with Timmy Trumpet performing his hit song “Narco” on the field as the All-Star closer entered the game.

“It was awesome,” deGrom said. “That was a great atmosphere. Fans were in it the whole time. That makes it a lot of fun. You’re playing important baseball, and we all have the same goal, and that’s to continue to win and see where we can go.”

The crowd of 41,799 was on its feet as Diaz jogged in from the bullpen with Trumpet’s rhythmic tunes blasting. It exploded as Diaz went on to strike out Trea Turner on three pitches. Chants of “Ed-win Di-az” followed as Freddie Freeman stepped to the plate. Diaz got both Freeman and Will Smith to ground out, capping the memorable evening and evening the season series between the two best teams in the National League at three wins apiece.

“They’re a great team, and they have been for a while. Nothing can be taken away from them,” Nimmo said. “But we do feel that we match up well, and it’s been good games that we’ve played against them. It’s two really good teams getting together and playing, and it feels like playoff baseball.”

The lights-out pitching was enough for the Mets (83-48) on this night, in part because of Nimmo’s outstanding grab in the seventh. Starling Marte’s 16th homer of the year, and his second in as many nights, gave the Mets the lead for good in the home half of the third inning.

Former Met Justin Turner nearly erased the deficit in the seventh. His drive, hit at 104 mph with an expected batting average of .790, looked like a homer off the bat. But Nimmo raced back and made the leaping grab against the fence, which he called the best catch of his career..

“I had good defense behind me tonight,” deGrom (4-1, 1.98 ERA) said. “Thankful for that.”

The usually stoic Nimmo celebrated with a fist pump. The crowd roared, and deGrom showed his approval by raising both arms and later grinning as Mets fans saluted Nimmo. In his at-bat in the bottom half of the inning, Nimmo was given another ovation.

“Every little thing matters in these games,” Nimmo said. “We obviously have the Braves on our tail, and so we want to try to win all the games that we can, and it’s a sold-out crowd and it’s electric.”

Marveled manager Buck Showalter: “What a play. When you look at minor league players, one of the questions I ask is can they turn hits into outs? I never ask can they turn home runs into outs? Maybe I should.”

DeGrom then closed out his longest outing of the season with his ninth strikeout, fanning Gavin Lux to complete seven innings of three-hit, one-run ball. When Nimmo got to the dugout, the two shared a light moment.

“He always tells me before every start, ‘I’m going to need you to play good defense out there tonight.’ It’s kind of facetious, we both know he’s going to strike a ton of people out,” Nimmo said. “So he came in [after the catch] and said, ‘See, I told you you needed to play good defense tonight.’ ”

The stadium was loud at that point and grew to deafening levels in the ninth. It sounded every bit like October on the final day of August.