Abstract: A method comprising: identifying a gesture performed via a GUI, for navigating a set of user credentials from a list into respective regions within a priority scale having regions indicative of relative priority for attendance, sending to the user credentials, invitations including time slots and locations each associated with a relative ranking score, receiving responses, each associated with relative response ranking score and a participation score, and computing a single time slot and a single location by weighting the relative response ranking scores and participation scores for the time slots and locations, according to the region of the respective user credentials within the priority scale and according to the relative ranking score assigned to each time slot and each location, and presenting, within the priority scale of the GUI, color coding indicative of likelihood of attendance at the single time slot and the single location by each user credential.