The success of any police security protection, including security of mass events always depends on knowledge about them and particular elements that may have an impact on their progress. Experience shows that often seemingly unimportant factors suddenly appear to be extremely important, and the omission of them - a very costly in the results. Permanent conducted reconnaissance of possible threats including constant collection and analysis of gathered data. Type and amount of resources used to counteract and performed activities depend on information about the current status of possible security threats. Quality of data about threats has a significant impact on ensuring security decisions accuracy and efficiency. The basis allows appropriate elimination of threats or prevent their formation is to obtain information anticipating planned security police. This information should include the nature of the project, organizers, participants, their number, how to organize, prepare, and their intentions.