There are a lot of sociological and economical factors here but the short answer is no, they're not given the same chance, and this is by the crowds as much as by the promoters. Female bands are by and large held to a much higher standard than their male counterparts, and a lot of that comes from the assumptions people carry about them that can color the viewing/listening experience. And again, discrimination doesn't have to be intentional. It often is subliminal. That's why it's so dangerous and hard to "prove" but as a woman in a band, yes - it's harder for us.