There you go: https://elpais.com/america-futura/2023-09-03/la-fuerza-del-c...
Pretty much Chaccu. Free festival. It's usually in June. You can make a trip of it going to Paracas, Ica's dunes, Nazca Lines and finish in Pampas Galeras. Keep in mind in Galeras there's nothing. Just a post of the National reserve and that's it. It's also at 4K meters of altitude so walking for hours could be a whole experience.