I posted this open thread yesterday because I wanted to ask a question that belonged in an open thread, but the last open thread was only until the date of February 17th. Is there a policy for who posts open threads, or how they're posted? If there is such a policy, does it go for only open threads, or for other special threads as well?

I noticed that different people post the open threads over the course of weeks or months when I was searching for them. I'm guessing that the policy is that if a given user notices there is no open thread for the week in which they would like to post, after searching for it, they create it themselves.