A system, method, and apparatus are provided for issuing content event notifications to members of a user community that makes content available to its members. Events involving content items of interest to a given member (e.g., creation, upload, sharing) are recognized, particularly events that involve another member connected to the given member in the community, and the relevance of the items to the member or to content topics of interest to the member is determined. Time slots during which notifications can be issued to the member are identified (e.g., using the member's calendar data), possibly in association with events on the member's calendar, and may be associated with one or more topics that interest the member. During a time slot, only notifications regarding content items related to the associated topic(s) may be issued. A do-not-disturb time slot may be defined as a period during which no notifications should be issued.