I would really like to be a ring girl for some fights. Does anyone know how that's done?

I knew one of the Bellator girls for a bit and she was on contract.

She was also a Playboy model, living in L.A., so I imagine she had a few connections to get in with them.  I don't know if she still works for that company or not.

I will assume you've already tried contacting the UFC organization?  If you haven't, I'd recommend you start there.

If there's a local arena near you where they hold bouts, just go by and ask 'em  .  .  .  or, check with the companies that are sponsoring the fights  .  .  .  not too hard to get in, just need to be a little persistent  .  .  .

SOS

I don't know about UFC specifically but for smaller local bouts, get in touch with the event promoters directly.

Don't know any promoters?  Go to some boxing clubs, muay thai schools, etc. and ask the owner if they know about any upcoming events.  Often the owner is also a promoter.