Last Question of 2020

I'm sitting here with a friend watching an advance screener I got the other day (like, three days in advance) of the new movie, The Prom. And here's what I want to know…

James Corden hosts a five-shows-a-week TV series on CBS. Where the hell does he find the time every year to appear in a major motion picture musical that gets horrible reviews but I think it's got a certain charm and is better than the critics say?