Two great ones that spring to mind.
Depping on bass for a cool blues guitarist/singer called Aynsley Lister at the Suwalki Blues Festival, in Poland, in 2016 - big stage in a park, awesome onstage sound, probably 1,500 to 2,000 people turned out to watch us, and we got treated like royalty all weekend by the promoters, which was amazing ha ha!
Also remember doing a lovely wedding gig at a farm in Mid Wales with my band in summer 2015 - a sort of marquee made from interconnected teepees in a field, with cocktail bar etc in it, which was all lit up and night and had a real little festival atmosphere on a hot summer night.
I was on lead guitar and vocals, and everyone was right up for it as the climax of the day's celebrations. The energy was incredible, as was the hog roast and real ale on tap, and the band played brilliantly. Remember utterly buzzing listening to Tom Petty on the long night drive home back to the East Midlands afterwards.