The cast was prepared to get rained on during Sunday's indoor-outdoor live performance

By Adam Carlson and Patrick Gomez
Updated January 31, 2016 07:35 PM
Credit: Tommy Garcia/FOX

Rain or shine – emphasis on rain – the show must go on, especially when that show is Fox’s Grease: Live.

The live musical event, starring Vanessa Hudgens, Julianne Hough and Aaron Tveit, was prepped under a (literal) cloud of uncertainty Sunday, given the rainy forecast in Los Angeles.

And, right at the top of the show, there was rain. During Jessie J’s performance of “Grease Is the Word,” the cast protected themselves while dancing around with umbrellas, somehow making dancing in the rain look easy.

“We definitely can’t move any of our outdoor scenes inside so we’ll have to use a tent or something – or people are going to get a little wet,” director Thomas Kail told PEOPLE ahead of the performance.

The three-hour production was triply complex compared to recent live TV productions such as Peter Pan and The Wiz.

It was shot on two soundstages and the Warner Bros. backlot, the cameras cutting between them, sometimes with wheeled transportation just out of frame to get the cast from A-to-B.

“We’ll be jumping off a golf cart and running into frame,” Tveit, 32, who played Danny Zuko, told PEOPLE before the show. “That choreography is going to be as complex as what’s going on in the musical numbers.”

Grease went on despite a second surprise as well, when Hudgens, 27, revealed just hours before that her father had lost his battle with cancer. Though, she said, she would perform anyway in his honor.