ACDC 'Black Ice' tour in Warsaw in May this year.
They performed all of their greatest hits, made a great show (among many, many stuff, they entered the stage with a steam train, they rung the Hell's Bell, and they fired cannons and fireworks during a two-song encore [one of them was obviously Highway to Hell]), and a motherfucking 17- minute (I counted) guitar solo by Angus Young. So much energy and awesomeness, I couldn't sleep that night, and my throat had to recover at least two days, after my voice chords were shattered from screaming. In fact, I need to listen to ACDC right now after just typing this.
Close second would be Opeth concert last year. No fireworks, just an ordinary show, but Polish fans once again managed to show the world, that we can make the best crowd on the planet. We sang 'Happy Birthday' to Mikael (twice, once in English and once in Polish, even though Opeth's 10th anniversary was in 2010, as Mikael noted afterwards, but who cares

), made a lot of noise, and we sang Drapery Falls, when Mike asked us to. Looks like he never expected us to do so well, because he was mighty surprised judging from the look. Amazing experience. And looks like Opeth liked it too, since they performed in Poland thrice in a 2 years span
