It is one of the most important cultural events in Halkidiki that takes place during summer. It is held every year at the theatre of Siviri, near Kallithea village, at the Kassandra peninsula.
It started in 1993 and many famous artists have performed there. Some of them are Milva, Goran Bregovitz, Jan Garbarek, Nana Mouschouri, Marios Frangoulis, and many more. Apart from concerts, there are also theatre plays, dance performances, and shadow theatre. While the cultural events include also photo, costume, and sculpture exhibitions.