title: Post Date Usability and Architecture
body: <p>I have an application that deals with events.  After an event has occurred, I need to email my users and ask them about the event, and allow to upload photos, etc.</p>
  
  <p>My question is 
  Whats the best way for my system to automatically detect that its "post event" time other than running some unix cronjob?</p>
  
  <p>I use MySQL - is there some trigger that I can set, either in PHP or MySQL?</p>
  
  <p>How do sites usually do this?</p>
  
  <p>Thanks,
  Alex</p>