This article presents an example of how a public science party was evaluated. The main goals of the science party, to increase the positive image of science and present an attractive science event, were evaluated in two ways. First, web surveys were used to determine the image of science before and after the event among paying visitors, invited guests, and a control group (N = 149). Second, during the event, visitors were interviewed about their experiences at the event (N = 124). The survey study showed that the image of science was very positive among all three groups of respondents. As no differences were found between pre- and post-tests, participation in the event did not lead to a more positive image of science. The results of the interviews suggested that visitors highly appreciated the event. In the Discussion, the evaluation study is analyzed and possibilities/limitations for future general use are discussed.