International Music Festival of the Aegean (Festival of the Aegean) ★ 4.1
The Festival of the Aegean is a Cyclades-wide classical music festival running each July with venues across Syros and partner islands including Santorini.
Tip: The festival's Santorini events are typically smaller-scale than the main Syros programme; check the official site for the year's specific Santorini schedule.