WordCamp Europe 2018 was on June 14-16 in Belgrade, Serbia.

The event website was https://2018.europe.wordcamp.org.

WordCamp Europe is the ultimate European WordPress event, bringing together thousands of WordPress professionals and enthusiasts from around the world together for a weekend of learning, co-working, networking and building relationships.

This video gives you an overview of the 2018 event:

https://www.youtube.com/watch?v=gvi9WcsvvF8