I truly hate festivals but the Sunday lineup for the Cactus festival (in Brugge, Belgium) is stunning:
http://www.cactusfestival.be/2018/programma_15_nl.asp
Nils Frahm
Mogwai
Slowdive
Goldfrapp
Suuns
Strand Of Oaks
Riley Walker
The Mistery Lights
I don't know the last three but all others are yummy. Well, Godfrapp don't know anymore, I loved the very first album then I lost them. But still wouldn't mind seeing them once more.
Lineup for the other days isn't complete yet, but not really for me. Triggerfinger etc.
Besides that:
Godspeed You Black Emperor are coming to Antwerpen in July, at a wonderful open-air theatre. Definitely going there!