The present study expects to identify technical determinants affecting the success of international conventions and relative importance of those in convention industry of Sri Lanka. Findings of the research would be able to apply in managing the events of convention industry. The conceptual model of the study was formulated based on the literature review comprises from three independent variables. This study is confined to the internal technical factors of the convention event projects and data was obtained from 84 professional convention organizers using quantitative online survey questionnaire. Impacts of independent variables on the dependent variable were tested and measured using statistical methods of regression analysis and one-way ANOVA analysis with SPSS 16.0 as the data analysis software. All three independent variables of marketing and promotion, financial management and techniques of project management were recognized as important technical determinants for the success of conventions in Sri Lanka. Marketing and promotion was identified as the most important technical determinant for success of the events which is followed by financial management and techniques of project management respectively.