In one embodiment a transportation request specifying a pickup location is received. The transportation request is associated with an event to be attended by a subscriber to a transportation service. A start time of the event is determined. A data source associated with the event is monitored to detect whether the start time of the event has changed. A pickup time to pick up the subscriber for the event is determined wherein the pickup time is based at least in part on the start time of the event and the pickup location.