title: requestAccessToEntityType - once or every time?
body: <pre><code>EKEventStore *eventStore = [[UpdateManager sharedUpdateManager] eventStore];
  
  if ([eventStore respondsToSelector:@selector(requestAccessToEntityType:completion:)])
  {
      [eventStore requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted, NSError *error)
       {
           if (granted)...
  </code></pre>
  
  <p>I want to ask the user for permission to add an event to his calendar. After it's granted do I need to ask for permission again when I want for example to remove an event (in another session after the app was closed and reopened) or is it just a want time thing?</p>
  
  <p>If it's a one time thing, can I just put it in ViewDidLoad at first lunch just to "get rid of it" ?</p>