Cobblers' apprentices asked their masters for permission to make miniature houses during the work shift. Each apprentice grabbed the nearest "camboh" (a wicker bowl or basket), filled it with wood shavings, mixed everything with strong glue, set it on fire, and placed the basket onto the water.

Since there no longer any cobblers' apprentices in Tržič, the custom is kept alive by children from schools and preschools of Tržič. They gather together on St. Gregory's Eve and float their miniature houses down the Tržič Bistrica. The programme is enriched by an exhibition of the "gregorčki" houses lasting several days and numerous accompanying events.