Just post your name in the message. The name will post on the website to show who got the serial code, even your name is not real.
Example:
Facebook Message:
Post on event page:
April 8 is the date of the event deadline and April 9 is the date of the serial code deadline. I don't know why they set the deadline on next week, but I believe we will receive the serial code before April 8. If all serial code distributed, the event should end.