I'm looking to complete my Pre-Greyhawk Wars stuff and I'm missing the City of Greyhawk box set. So a quick question: Is the City of Greyhawk box set set before or after the Greyhawk Wars?
before. In fact, some of the info in CoG is updated in the Greyhawk City booklet in "From the Ashes". If you can't find the original boxed set anywhere, you can get it in booklet or PDF from from DTRPG; be advised that the maps are all chopped up in the former though...