Midzomerving says

Stichting Native European Rights is organizing a Midsummer celebration at the Kralingse Plas in Rotterdam, The longest day of the year. There are approximately throughout the day 35 participants, Among them is present Jan van de Kar, Boy van Velzen, John Abrossimow, Peter van Vliet, Anna Lucia van der plas, Willem van Heijningen and Martijn Janssen. Music is made by Stephanie Lehmann and the Folk Duo Loes Schaijk and Horza Bartisek. There is also dancing and jumped over a small fire.