Octagon Ground Attack Challenge Balkan Open Octagon Ground Attack Challenge Balkan Open GI/NO GI  will take place at 2 March in Thessaloniki Katsanio Sportshall in Greece  under the auspicious of ISDO and IBU. The tournament is open to all organizations and grappling styles. The weight-in will start at 10:00 and the fighting at 11:00 Payment[...]