So many that my answer is just listing most of the concerts I can remember going to
The Midnight
Roosevelt
Tycho
DJ Shadow
deadmau5
Perturbator
Rush (RIP Neil)
Celldweller
The Crystal Method
Psychostick
Above & Beyond
Kodo (Japanese taiko drummers)
Lateralis (chiptune musician and indie game dev)
If I had to pick the three most memorable, it'd be Kodo, DJ Shadow, and The Midnight