The theatre was divided into four sections to keep patrons socially distanced and with a maximum of 100 people in each section. Each section had its own exits and entrances, and toilet facilities.
The show was eventually performed in late August and early September.
"What we managed to do was something no one else in the world has been able to do," Act Three Productions president Merryn Osborne said when receiving the people's choice award.
Mayor Grant Smith said it was an understatement to say 2020 was a difficult year, but especially so for the performing arts. One word captures the essence of 2020 – perseverance, he said. Eighteen productions across the wider regions still managed to be staged last year.
The evening started on a reflective note with a waiata tangi to acknowledge the deaths of Henare Green, father of actress Carrie Green, and theatre luminary Pat Snoxell, who died earlier this month.
Cr Rachel Bowen also acknowledged the death of Snoxell, noting he cast her in the Sound of Music as an understudy nun.
"Pat would have loved this and we loved him and this is special to think about him tonight."
She described Sister Act as the show that kept on going, the show Covid couldn't stop.
Sister Act's haul of awards included direction in a musical (Andrea Maxwell), male supporting actor in a musical (Shannan Jacobs), female supporting actor in a musical (Jo Sale) and male actor in a musical (Chris Thompson).