You're allowed to make teams or go solo!
There is no centralized place to collect and chat just yet, however I'm part of an RPG Maker Game Jam Community Discord Server, which you may join and talk about.
It's not the official meeting place, and there are other jams going on there, too. I'm also not an expert of managing discord servers and will probably not have much time to moderate it, so for now, you may use the community forum here at itch.io as the official communication place for this jam.