A method of delivering event notifications includes receiving data from a network-based calendar system at a notification system. The data indicates that a notification related to a calendar-based event is to be sent to a subscriber. The method also includes receiving presence information related to the subscriber from a presence system. The presence information indicates whether the subscriber is present at one or more of a plurality of subscriber devices. The plurality of subscriber devices includes a set-top box device. Further, the method includes sending an event notification related to the calendar-based event to the set-top box device when the presence information indicates that the subscriber is present at the set-top box device.