jkind, welcome to the party! Glad you are here - we have a lot of things going on, so be sure to read the info in the first thread for details about meets and such that are planned (there are links to spreadsheets with cruise events, excursions, who's sailing, etc.).
I'm Cindy D., traveling with DH (Gary), and two teenage boys. We are also doing the cruise before this one. These will be our 7th and 8th
DCL cruises, all on the Magic except for two on the Wonder. We haven't had a chance to sail on the Dream or Fantasy yet.
As for what to bring to Europe, I would say your Passport

Because you can't get there without it! As for other things, I would say your ATM card so you can get Euros for when you need them while in the ports. And your camera - don't want to miss those photo ops.