Each and every mass event is an enormous logistics undertaking. The principal task of the organizers of a mass event is to make sure that those who participate in it are safe. Ensuring safety during a mass event consists in, among others, organizing the services ensuring the safety of an event venue. The principal objective of this dissertation was to study the mass event participants′ satisfaction with the selected aspects of safety, which included: the actions of the security staff members, the work of the information services, and also medical security. In this dissertation, it is as well the results of research concerning acquaintanceship with the rules and regulations of an event, and also the influence exerted by it upon the perception of the above-described aspects of safety by participants in an event. The research was conducted in February, 2016, on the group of 2,300 individuals, who had participated in XXII Rzeszow Juwenalia, the largest student festival organized in the South-East of Poland. Conducting a survey amongst participants in XXII Rzeszow Juwenalia made it possible to achieve the described objectives, and also to obtain plenty of information concerning that event. For the analysis of data, the STATISTICA program was used. In order to determine the correlation between qualitative traits and the quantitative ones, the ANOVA Kruskal-Wallis test by ranks was used.