The local community stands out as one of the stakeholders of the event who can participate in it in various ways. Successful cooperation with all stakeholders, including the local community, creates the conditions for long-term sustainability of the event which is the goal of every organizer. However, residents' attitudes and concerns related to the event are often neglected when planning events and making decisions or no effort has been made to discover them. Their dissatisfaction can very quickly create resistance to the event and tourism in general which, of course, are not favorable circumstances for the event. The problem of this thesis are unexplored perceptions of local residents of Sinj about the impacts of Alka which is one of the most important and largest events in the area. Therefore, the aim of the study was to reveal these perceptions and determine whether they change with regard to the demographic characteristics of respondents, more precisely age, gender and level of education. Results showed that perceptions of local residents about tourism-economic and socio-cultural impacts are mostly positive and perceptions about physical-environmental ones are not mostly negative. Also, research has shown that residents' perceptions do not vary with demographic characteristics.