I have been rejected. Got the mail just now.
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Thank you for your interest in the Google Wordmasters Challenge 2006.

While we appreciate your application, we regret to inform
you that we will not be able to invite you to participate in this
event, this time.

Wish you the very best!
The Google Team

its closed for registrations..
http://www.google.co.in/events/events_full.html

<<Thank you for your interest in this event. Registration is now closed. >>

I've been told the challenge was "Use all these 20 words in 200 words or less." [Thanks Patrick D.]