The audience’s excited oohs rose to loud cheering as Kuhn pulled out a wedding ring box and got down on one knee. Some actors began to jump up and down.

“Shawn Marshall, will you… marry me?”

The crowd erupted. Marshall nodded yes.

Tyler Johnson-Campion (11), who played George in “The Wedding Singer,” said, “[I was] shocked. I didn’t even know, I thought he was already married.” The proposal was originally a secret: “We weren’t supposed to know, but before the end of the performance, it had gone around. Everyone knew,” Johnson-Campion said.

Jordan Kuhn (10), Kuhn’s son, knew of the proposal about a week in advance. “Every day except the day directly beforehand, [Mr. Kuhn] was really confident about it; he had everything planned out that he wanted to say. But on the car ride over to YPAS, my little brother kept saying, ‘What if she says no? Dad, seriously, what if she says no, what about that?’ He just kept making him worry more and more,” he said.

“I don’t get nervous in front of people. You could put me in front of 5,000 people and I wouldn’t get nervous, but I was for this,” Kuhn said. “[Shawn] kept saying, ‘I cannot believe your guts and how brave you are. Wow, it’s been hard for me to concentrate at work.’”

Max Abner (11), assistant director of “The Wedding Singer,” said, “I think it made the whole show a lot better. We had to change some of the technical stuff at the end because we knew we were working toward that. It was adorable.”