I've extensively researched the March 9th show in the past because I was confused about this. Existing sources are wrong: I've tracked down a March 9th attendee who only recalls one show, a review from the LA Times of the March 9th show making zero mention of a two show day, and print advertising for the shows doesn't mention two shows on the 9th. I know the person who runs queenconcerts - it's a great site but outdated and wrong about many things. The ticket stubs for March 9th don't indicate two shows played either - in fact neither of them have timestamps printed on them.
I've extensively researched the March 9th show in the past because I was confused about this. Existing sources are wrong: I've tracked down a March 9th attendee who only recalls one show, a review from the LA Times of the March 9th show making zero mention of a two show day, and print advertising for the shows doesn't mention two shows on the 9th. I know the person who runs queenconcerts - it's a great site but outdated and wrong about many things. The ticket stubs for March 9th don't indicate two shows played either - in fact neither of them have timestamps printed on them.