Siren returns to Bristol’s Harbourside for summer 2026 with its signature open-air music series at the Bristol Amphitheatre. 

The festival kicks off on 23 July with a headline performance from The Maccabees — their first Bristol show in 14 years. 

Siren is known for curating a mix of indie, electronic, drum & bass and club-friendly lineups across multiple days. Past editions have featured everything from headline indie rock to all-day drum & bass takeovers and progressive house legends. 

Set beside the water with its harbour-side views, the Amphitheatre offers a unique urban festival vibe — combining big-name acts and local talent in a memorable open-air setting.