User blog comment:LexiLexi/Lucky Users Receive First Pottermore Invites/@comment-3464779-20110811172345/@comment-4225467-20110811172723

Yes, if you didn't find the Magical Quill, you can't get in until October. I recommend you go to insider.pottermore.com for more info on when you'll get in if you DID find the quill.