The diploma thesis deals with the use of event marketing in the communications strategy of OBO Bettermann Praha which operates in business-to-business market in electrical engineering. The first part looks into event marketing from a theoretical point of view. The second part firstly introduces the company OBO Bettermann Praha and its marketing communications. Subsequently is the influence of event marketing on the company's business relations with its customers and business partners explored (currently the main pillar are theater evenings). The survey is conducted by online quantitative questioning of event's participants and qualitative in-depth interview with the director of the company. The survey results are evaluated in the final chap...