The Unreal User Group Vienna is a loose union of like-minded. They are exchanging ideas, help each other with technical problems regarding the Unreal Engine, or talk about general gamedev subjects. They also have a direct contact to Epic Games, so someday in the future it might be possible to organize an Unreal Day in Vienna with developers from Epic.
Taking part is free and doesn’t even require an official application. All you have to do is to write them an email, visit them on Twitter, and drop by at one of their meetings called “Stammtisch”.