Yes, definitively.
Graspop almost every year since 1999.
Arrow Rock Nijmegen once (for Kiss, Twisted Sister, Journey, Reo Speedwagon, Kansas)
Very 'Eavy Festival Stadskanaal 2015 and also this year, Yeah!
Numerous shows (can't list them all, but the ones that come to mind are Gwar , Gamma Ray, Helloween, Saxon, Grave Digger, Hammerfall, Hyades, Onslaught, Primal Fear, Brainstorm, Ancient Rites, Axel Rudi Pell, Megadeth, Evile, Stormwarrior, Evidence One, Manowar, Queen, Deep Purple, Sabaton, AC/DC, The Darkness, Firewind, Pagan's Mind, Thin Lizzy, U.D.O.)