I've been to Oasis and M4 in the past 2 months, because my female partner was interested. As a non-pretty human being who isn't female, I got absolutely no attention.
M4, during an event where single men were welcome, the ratio of men to women was about 3:1. The entry price was $40 for couples, $80 for single men, and free for single ladies.
As for Oasis, we attended when single men were not welcomed, only couples and females. I'm not positive, but I'm guessing that female presenting trans folk were also welcome. As a male, I got the impression that I wasn't really supposed to be there unless I was with my female companion. I messaged someone who seemed to represent Oasis on another message board, but they never replied. The price was $15 for women, and $100 for men.
I'm not in a rush to return to either venue.