Progressive Web Applications (PWAs) are a modern approach to creating web applications that, by leveraging progressive web technologies, strive to capture the best features of web and mobile applications. Their creation is based on the principles of progressive improvement. Thereby users which cannot access such applications through modern browsers can still use the basic functionality of the applications, while users which have access to modern browsers can achieve a significantly improved user experience. In the theoretical part of this thesis, the most significant progressive web technologies were elaborated, as well as the ways in which their integration enables the creation of applications similar to native applications. Also, as the project part of the work, a progressive web application for event management was developed. The background layer of the created application was implemented modularly, while the client interface was realized as a single page application. The development of the applications itself was preceded by the analysis of similar domestic and foreign systems of the same purpose, which worked out the functionalities of the applications. Finally, all the technologies used were described and instructions for running the application on one’s own server are given.