As you can see PTN staff has ended the Invitefest weekend and thake back all the invites that were not been user , and they said that invites will not be given again for a long long time!
PTN staff wrote this:
"That was all folks, Invitefest has ended, from now one all invites are closed, may never come back, except donors+ that still can use invites.
Welcome all new users, use you account and take care of it. Soon will start to remove all inactive members."