The purpose of this study is to identify the factors that affect the selection of the agenda, which is the core content of convention events and the mechanism of agenda decision-makers' adoption of the agenda. In the convention industry, the agenda is the most important keyword faced by society. Although it plays a role in determining the success of the convention, related research is lacking. Therefore, in this study, an empirical study model was presented by referring to the decision processing through the personal information processing and the usefulness of the information. In addition, the attitude and impact on the agenda were analyzed by adding social norms and government policy agenda variables, which are social impact variables, in consideration of the convention context. Based on qualitative interviews with convention experts, a survey was conducted and a total of 203 data were collected. As a result, it was found that the association and timeliness of the agenda as a quality factor of the agenda act as a leading factor in the usefulness of the agenda and the necessity of the agenda. On the other hand, agenda necessity and source credibility did not significantly affect the usefulness of the agenda. It was confirmed that social norms and government policy agendas showed different results in attitude and intention. This is expected to be an academically and practically useful barometer by further organizing the theoretical framework of research on the convention agenda selection process, which was conducted without a rationale by using the information adoption model.