By exploiting the cancellation of the 2012 American Political Science Association Annual Meeting, we investigate the role of conferences in facilitating academic collaboration. We assembled datasets comprising 17,467 academics, and in difference-in-differences analysis we find that the conference cancellation led to a decrease in individuals' likelihood of co-authoring an article with another attendant by sixteen percent. Moreover, collaborations formed among attendants of (occurring) conferences are associated with more successful co-publications: an effect which is sharpest for teams that are new or non-collocated. Conferences seem to de-cluster the co-authorship network. Altogether, our findings demonstrate the importance of conferences in scientific production.