Ask HN: How are startups getting into office hours these days?

I know the next YC batch hasn't started yet, so where are these current companies doing office hours on startupschool videos coming from? Are they former YC grads?

There used to be a form every now and then to ask to be in "open" office hours but the only one I see now is for females only.

I read the FAQs and can't find anything. Any insight?