Secret-Lineup Festival SON Estrella Galicia Posidonia Turns 10 in Formentera
A Coruña – September 28, 2026 -- SON Estrella Galicia Posidonia marks its 10th anniversary with a special edition running October 2–4 on the Spanish island of Formentera, capping a decade built on secrecy, intimacy and sustainability rather than mega-lineups.
The festival caps attendance at just 350 people per edition
Unlike most music festivals chasing bigger crowds, SON Estrella Galicia Posidonia has kept its guest list deliberately small since launching, revealing its artist lineup only once the event begins. The 2026 edition, themed "(re)discovering Posidonia," revisits artists and locations that have defined the festival's first nine years.