For me it was Wolfmother at a major German festival. I didn’t really know them before and did not expect too much, but was totally blown away by their performance.
Decades ago I saw the Rolling Stones. It was held in an arena. I was fortunate enough to sit in one of those skyboxes. Because of its location to the stage, from a corner of the skybox you could actually see behind the stage. This area was just a huge curtain as all seating behind the curtain was closed. During certain songs some band members would go behind the curtain. And it was a blast to see some of them jugging down vodka which was clearly visible from my vantage point. And the show was great.
I’ve seen Dave Matthews Band, Gin Blossoms, Daft Punk and gone to Pink Floyd laser shows (Pink Floyd wasn’t there themselves tho) and more, but not one of the massive artists I’ve seen compared to the final show by a band some of my friends in high school had made (and I can’t even remember the name they went by at the time; I only remember the original name of Kill the Messenger). They did it outside another friend’s barn that had been converted into a skatepark and they wanted the crowd to just get all up in their shit as they played. Like, I was basically hugging the lead singer while they performed and they fucking ruled! They sounded like the Mars Volta which was still pretty new at the time and I really think that had they not all split up across the country to go to various colleges, they could have actually made something of a musical career.
Muse for the Simulation Theory tour. Marching bands, laser beams, a giant robot (Murph). It was an incredible show.
Motörhead
The band played 2 early albums + their latest one in sequence. Listening to whole albums in one go was great for many reasons.