The biggest bonfire will be lit on Rožnik hill in Ljubljana, where the keynote speaker will be Lidija Jerkič of the Association of Slovenian Trade Unions.

Andrej Zorko, the association's executive secretary, will address the crowd in Leon Štukl Square, Maribor.

Many areas will be woken as early as 6 a.m. by loud music in a May Day tradition known here as 'budnice' or 'vigils'.

Foto: BoBo
Foto: BoBo