European Festival Suggestions Anybody?

Hey guys! So my partner and I are planning a trip to Europe in about a year from now. We are thinking anywhere between May-July of 2017. We are quite interested in experiencing the DnB scene over there, but we are open to pretty much all electronic music genres. So I was wondering if you guys had any suggestions for some music festivals/events. Preferably in the 15,000 people or less range with a very "community" type feeling. Any info you guys have would be great! I've tried doing some googling, but only receive results on very large festivals. I'm kind of looking for those smaller niche festivals that not everyone knows about, but are real gems. Thanks in advance!