RPS really isn't my fandom, but Jared's pretty popular with some of the SPN circles, which is probably why they're holding it. Sometimes these minievents are just a few circles fangirling together about something, sometimes with a collaboration antholigy or goods or something. I'm not sure what's going on here.

The id is padalecki, the pass is 19820719rps. In addition, if you look at the circle listing, genre view, you can control-f for 193, the circles are marked, at least some of them.

As for neji, I'm not sure. You'd have to check her website or blog, but I dont recall seeing any updates yet.