Circus Under My Bed runs from January 14 to 25, as part of the venue’s Summer at the House program, mixing high-impact acrobatics, old-world circus and caberet.

Artistic director Jodi Farrugia said the show’s performers, aged 10 to 18, were thrilled to be performing at the venue.

“It was sold out before we finished rehearsals, which is amazing,” she said.

“It’s pretty flattering when you know you are going to perform to a full audience every night.”

Set in a tent-like stage, the show is about a five-year-old girl who is spending the last night in her bedroom before moving the following day.

The girl dreams up a circus of imaginary friends who help her pack and come to terms with the move.

“It’s full of beautiful characters set in a young child’s mind,” Miss Farrugia said.

“It’s about how imagination is used to process their emotions.”

The troupe is in its second last week of rehearsals, making final adjustments to sound, costumes and lights.

Miss Farrugia said it had been fun workshopping the show with the young performers who easily understood its imaginative narrative.

“We’ve had a gorgeous month of rehearsals,” she said.

“They’ve been working hard and are doing a wonderful job.”

Executive director Richard Hull said the company was “pumped” to be performing at the Opera House for the first time in 20 years.

“It’s a really big deal to be back at the iconic venue,” he said.

Mr Hull said the show was the only one to have sold out in the Summer at the House program.

“It’s a really great endorsement of the Fruit Fly Circus, it reminds us of how well-loved we are,” he said.

For the young performers, Mr Hull said it would be a life-changing experience.

“Every one of those kids is going to remember the two weeks they played at the Sydney Opera House for the rest of their lives,” he said.

“The region should be proud.”