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