The authors point to the characteristic features of mass events with tournament character and possible dangers connected with their organization and course. The contents of the publication refer to the experience gained during the organization of the European Football Championships ”EURO 2012”. It presents vital aspects of actions undertaken by subjects involved in protection and order keeping during mass events with tournament character. The vital element of the publication is the authors’ ideas connected with the improvement of security during mass events with tournament character, which will be organized in Poland in the future.