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Due to the grandeur of the Demon Race's preparations, and the prohibition laid upon each wedding invitation, one could activate it to illuminate the unique symbol of the Demon Race on the invitation, thus granting entry to the Heavenly Court to present congratulatory gifts. This way, imposters with fake invitations could be prevented. In the Heavenly Court, the Demon Gods had arranged for registrations and received the guests there to attend the ceremony.
However, those who arrived first were mostly lesser Primordial Creatures with low Cultivation. The Primordial Great Powers, on the other hand, always arrived late, or rather, they made it just in time toward the very end.