The department arranges speakers throughout the school year to present topics in computer science which are accessible and interesting but not likely to be covered in regular courses. Speakers are advised to aim their talk at students. These talks are a good way to widen one's knowledge and awareness of computer science. Refreshments are served, and there is an opportunity to chat with the speaker, with faculty members, and other students before or after the talk.
The time and day of the week vary, so please check the colloquium website, and watch for announcements in class, the Science Center fliers, and mailing lists such as the CS-Students Google Group.