Why Nicki Minaj canceled her concert at Saudi Arabia?

Because she wanted to show support for women's rights, gay rights, and freedom of expression.

It’s a holly land she’s not allowed there unless she converted to Islam by the will of god. This disgusting thing in a holy land is not acceptable. So shame

It was supporting the LGBTQ movements, as Saudi culture can segregate and discriminate against people whom are not heterosexual.