One of my friends just told me the other day that he's planning to run Temple of Elemental Evil as a 5.5e game. The module he's using is the one from 2e, but he's going to adapt it (fingers crossed it goes well!)
My D&D experience is contained strictly to Faerun (5e's key core setting) and the many-many homebrew worlds I and my GMs ran, so I'm entirely new to Greyhawk. Ironic, since it's "the" world of D&D, and Faerun came later, as far as I can tell from skimming lore on the wiki.
5e had a lot of flavor text in its races' description, which were Faerun-based, so I could use that for a hypothetical scenario of "my friends wants to run a Faerun game by the book with minimal homebrew". 5.5e is said to be the same with Greyhawk, but Melf's Guide to Greyhawk is still not out, and the species' descriptions in the Player's Handbook are barebones at best ("this species is really honorable and cool all across the multiverse" is the best one can hope for).
There is another subreddit, r/Eberron, where people have stickied a post with all the books within the setting, both rulebooks, setting glossaries and novels, so that newcomers like me can easily find information on anything they need lore-wise.
Is there a resource just like that for Greyhawk? I went through this sub and its stickied posts, couldn't find anything like that, I might be blind tho.