One by one, as the tournament progressed, the referees, when given confirmation, discreetly issued special invitations to those participants they saw had the potential they were looking for...
They couldn't exactly go flashing the viewers around, or customers would confuse it for new merchandise and start asking questions, but the owner managed to confirm what they could all sense. He gave nods when they looked to him, and allowed the match to go on as normal.
All the Duelist Society needed to do now, was wait and hope their prospects could follow simple instructions:
1. Open Once You Are Alone, No Sooner
2. Tell No One You've Received This Invitation
3. Come to Old Domino City Cemetery at Midnight Tomorrow Night, For An "Invite Only" Secret Event
4. Further Instructions At Cemetery Gate
5. Come Alone
6. TELL NO ONE