Welcome to Rokkenjima! You can follow along with our Umineko tea parties by reading (or posting) in the forum threads per episode. There are also podcasts you can listen (and participate in!) to that cover all of the theories brought up in the forum (there are only podcasts/tea parties for the question arcs as the tea parties are following along with the steam rereleases of Higurashi and Umineko). All of these things also exist for Higurashi. I highly highly recommend you follow along with either the tea party on the forum or the podcasts, as it makes the experience even more complete!
In the tea parties you can talk about your current theories (for Higurashi and Umineko) and attempt to solve the mysteries of 07th Expansion with other great detectives at your side! There are some pretty fun theories on Rokkenjima, some serious and some quite silly. There’s also other things to do on Rokkenjima too, like talking about visual novels, mystery novels, books in general, the worst day in the week, pizza, caffeinated beverages, you can even share your VNDB list and MyAnimeList!
Good luck solving the witch’s epitaph~ Kihihihi~ 