While witches have always existed in the Salm valley just like anywhere else, the folklore group of the Macralles du Val de Salm has only been in existence since 1955. Every year on 20 July, the Macralles gather at a place called Tienne-Messe to celebrate their Sabbath. This son et lumière show stages amusing anecdotes about what has happened to certain of the people of the Salm valley during the last year, all in the Walloon dialect. Then the next day, they march in procession through the streets of the town during the Fête des Myrtilles (Blueberry Festival - July 21). The story of the Macralles is drawn from a local legend: the legend of Gustine Maka.