     @IBOutlet weak var descriptionLabel: UILabel!
     @IBOutlet weak var descriptionField: UITextView!
     var invited: [User] = []
+    var invitedUsernames = NSMutableArray()
 
     @IBOutlet weak var invitedCollection: UICollectionView!
     var photos: [UIImage] = []

    
    func friendPickerDidSelectUsers(friendPickerVC: FriendPickerVC, users: [User]) {
        invited = users
        invitedCollection.reloadData()
    }
}

        event.startTime = startTimePicker.date
        event.endTime = endTimePicker.date
        event.photos = Photo.photosFromImages(photos)
        let invUsernames = invitedUsernames as [AnyObject] as [String]
        event.invitedUsernames = invUsernames
        
        event.createWithCompletion { (success, error) -> () in
            if success == true {
