I. Introduction
Many people live in a dynamic urban space in which every minute, several planned and unplanned events are happening at different locations. In such an environment, it is not easy to know about interesting events going on without prior planning. This is particularly true for people who live there because they do not check tourism-related resources each time they go out. Furthermore, they can have free time unexpectedly due to unforeseen events such as a canceled meeting, or a missed train. In such situations, people may want to explore surroundings and it is helpful to know if any event is currently happening in the vicinity, or which places are popular at the moment.