During the 42nd International ACM SIGIR Conference on Research and Development in Information Retrieval (SIGIR 2019), Distinguished Professor Bruce Croft gave a keynote address on "The Importance of Interaction for Information Retrieval." The conference was held in Paris, France from July 21 to 25, 2019. Prof. Croft's keynote presentation is available for download.
While in Europe, CIIR Director Croft was also a Lecturer at the 12th European Summer School in Information Retrieval (ESSIR 2019) held in July in Milan, Italy. His lecture on how to do research on information retrieval can be found here.