We get it, you want us to hear your daughter sing. I feel like it was an Olivia Rodrigo x Billie Eilish concert with pans and cameos of the actual storyline. This was probably the most blatant nepotism I've ever seen in a movie. (The singer in the show is his daughter)
And as someone who goes to at least 20 concerts a year, the most times people take a bathroom break is once or twice. The concourse would be EMPTY and anyone not rushing to go back in the show would be seen as suspicious.