Systems, methods, and computer-readable storage media for adding users to groups of content items organized into events based on a common attribute. An example system configured to practice the method can receive, from a client device, content items uploaded to a synced online content management system, wherein the content items are associated with an account of a first user. The system can cluster at least some of the content items as an event, wherein the event is associated with a common attribute, and identify a second user satisfying a minimum similarity threshold for the event based on the common attribute. The system can provide a suggestion to share the event with the second user. Upon receiving a confirmation of the suggestion, the system can make content items clustered in the event available to the second user.