The main purpose of the article is to present the tasks and the role of the leading service during the preparation and then the implementation of securing a mass artistic and entertainment event. The subject of consideration is the safety of the participants of the Pol'and'Rock music festival, which took place in the Lubuskie Voivodeship, on the territory of the Republic of Poland. Particularly assessed was the process from the submission of documentation by the festival organizer up to the solutions adopted by the leading service in terms of ensuring the safety of participants in connection with the emerging new threats, in the form of the development of new technologies. The identified threats include, among others, the dynamically developing market of unmanned aerial vehicles and new methods of operation of the perpetrators of terrorist attacks. The time frame covers the period from 1997 to 2019. The article attempts to verify the research hypothesis: does the leading entity fulfill statutory obligations arising from the content of applicable normative acts in the field of ensuring the safety of its participants during a mass event? The methods used in the study are the theoretical method (analysis method and inference methods) and the practical method (comparative method). Conclusions from the conducted research are presented in the summary.