The colloquium takes place every other Wednesday afternoon, 16:00-17:00 in the MathLab 9th floor, NU building (the seminar room next to the common area). After the colloquium we usually have a social hour with the speaker at Bar Boele from 17:00—18:00.
For more information, see https://sites.google.com/view/general-mathematics-colloquium/home