1. A method comprising: receiving information about an event from an inviting user of a social networking system, the information including one or more of a location, a time, and one or more users of the social networking system who are associated with the event; accessing user profiles of social networking system users connected to the inviting user and not already associated with the event; selecting a set of candidate users from the social networking system users connected to the inviting user and not already associated with the event; predicting whether a suggestion to the inviting user to invite each of the candidate users to the event would lead to the candidate user's joining the event; selecting one or more candidate users from the set based on the predicting; and sending a suggestion to the inviting user to send an invitation for the event to the selected one or more candidate users.