While that is true, she could still be interested in going to some event. Perhaps some star she likes has a new thing out, or a new toy is being released perhaps, could even be the release of a new movie that she wants to see.Maria quit being a professional camgirl around the time she got together with MC. I believe it was the event where the creep showed up.
A adult industry convention could also be an option, they are much like gaming/scifi/anime conventions, but with adult movies and toys.
Here is an idea, not the same, but very similar, and might work better with the plot. How about Hana wants to go to an anime convention to sell her doujin. She is too shy to go, but Maria talks her into doing it. She could volunteer to be the barker and dress up in a really sexy cosplay. The MC goes to help, and things get kinky, maybe the 3 of them act out one of the scenes and she ends up selling out, just off the top of my head... Not sure about the ending. XD