App for notifying users of autograph signing events

An easy and simple app that allows users to notify others of autograph signing events. Must be easy to use. Allows users to post events. Allow other users or the admin to verify the event. Possibly have it integrate the post with a Facebook page. Users can have preferences of when to be notified based on location, celebrity/athlete, sport etc.. option for users to pay for additional functions which we can discuss later. Section for users to post their picture with the celeb. Must be app store approved.