“Baby,” Ariana DeBose confided, “you are always on.”

DeBose, an Oscar winner and a longtime Broadway phenom, was speaking of herself, in the second person, last Saturday evening. Dressed in a beige ribbed tank, athletic shorts and chunky heeled boots, she was still glistening from a rehearsal for Sunday’s Tony Awards broadcast. “On” is an understatement: This will be her third time hosting the ceremony, and her first time producing and choreographing.

“Why I did that, I’ll never know,” she said. “Dear lord, the Tonys is just one giant learning experience. You have to be humble.”

Humble. And very busy. DeBose is 33 but still very much a theater kid. Her speech was fast, excitable, and when not vaping from a hot pink pen, she had a tendency to reach out to pat my arm or leg, an intimate form of emphasis. Soon, she would take herself out for a hurried plate of pasta before racing to an evening show. For the past two weeks, DeBose has been on a mission, however implausible, to see all of the nominated plays and musicals.

Until the end of May, DeBose had been in Winnipeg, Manitoba, shooting an action film, “With Love.” She arrived in New York City the Saturday before Memorial Day and saw her first show that Sunday. On the day we spoke, a week before the broadcast, she had just three shows remaining. (One, “Water for Elephants,” she would see that night.) And this was in addition to arduous rehearsal days.

“These are opposite processes,” she said of hosting and spectating. “They’re very different disciplines, but you can’t host if you don’t know who’s involved. So to me, it’s a requirement.”