Boii, z.s. is a Czech nonprofit association based in Nasavrky in the Pardubice Region, founded in 2002 to promote the Celtic heritage of the Železné hory (Iron Mountains) area. It created the Země Keltů open-air museum, which has drawn over 20,000 visitors a year since opening in 2016. Since 2007 the association has organized the Lughnasad International Festival of Celtic Culture, an annual summer event that brings together performers from across Europe.
The jubilee 20th edition of the Lughnasad festival will take place on July 31 and August 1, 2026 in the Land of the Celts in Nasavrky with the theme of the story of the conqueror Brenna.
The Lughnasad festival received the prestigious EFFE mark from the European Festivals Association for 2026 and 2027.
The 19th edition of the Lughnasad festival took place on July 25-27, 2025 in the Land of the Celts in Nasavrky.
The 18th edition of the Lughnasad festival took place on July 26-27, 2024 in the Land of the Celts area.
