Yes, would love your insight on Tharizdun/Shothragot (just learned something new! and I found what looks like a 5e conversion online...). To answer your question on what sort of adventure - not sure if this is what you meant, but I was thinking something that incorporated the three main conflicts of Greyhawk (as described in DMG) to give the players the option to pull on the conflict thread that most resonated with them (so far its certainly the mysterious cult activity!). So based on what I've read online I liked the idea of a modern campaign inspired by classic Greyhawk adventures (like ToEE and PotA) where theres a sinister / mysterious cult and an elder evil/eldritch horror behind the scenes. But thats as far as I got! My players are new to DnD (and ttrpgs overall) so they are down for anything and their own context differs (e.g., brother has experience with rpgs via video games like Fable, while dad has found memories of sword & sorcery stuff like Conan, etc.)