Open'er Festival returns to Gdynia, Poland from July 1-7, 2026, featuring an eclectic lineup spanning pop, rock, house, punk, and electronic music. The festival showcases major headliners including social media star turned musician Addison Rae, Scottish DJ Calvin Harris, indie legends The xx, gothic rock icons The Cure, and acclaimed post-punk artist Nick Cave & The Bad Seeds. With 27 artists representing seven countries including Japan, United States, Netherlands, Germany, United Kingdom, Sweden, and Australia, Open'er Festival offers a diverse international music experience. This week-long celebration brings together established legends and contemporary stars across multiple genres for one of Poland's premier music events.