HikerSkier saiddoesn't membership in the EU require member states to recognize the status of events done in other states (e.g., marriage)?
No. Same-sex marriage has never been addressed at the EU level.
And this isn't even about marriages performed elsewhere in the EU. This is about marriages performed by local governments in Italy, so they were never really official in the first place, since the national government doesn't recognize them.
roadbikeRob saidItaly is still quite conservative and uptight...
False. Italy is very liberal by world standards and moderate by European standards, so about the same as the US. The conservative countries of the EU are the former-communist ones (Poland, Hungary, Romania, etc). Southern Europe is moderate. In Italy, support for same-sex marriage has been gradually rising according to public opinion polls, especially among younger generations. One thing to remember concerning public opinion in Italy is that Italy is an aging society with a low birth-rate and a very high old-to-young ratio, so public opinion includes a massive older population.