Do we need to submit the finished project on itch.io or do we need to assign our worlds a special tag to be findable?

Submit your finished project here on itch.io. You'll need to create a 'new game' and you can add all sorts of info about your world there, like a description, pictures, videos, etc. You can also enable comments, etc. Then click on "Submit Your Project" on the main VRChat Sketchbook Jam page and include the URL to your world there. We'll add some info to the main page to illustrate.