I understand that. You should just explain that to Lego and ask that they remove it, as should others who got it.
They'd probably respect y'all a lot for that.
I sent LEGO an email :
I need to know a way to remove a badge from my page.
The LEGO World Event badge, gotten from Echo's Page.
When I got the badge by guessing the code, I thought we were supposed to... like a publicity campaign for the event... and I am pretty good at guessing stuff.. I did not know the prize would be a badge. When the mail from Echo was deleted, the badge appeared on my page.
I never thought of it as lying or cheating. Now I wish there was a way to get it off my page, because I do not want to have a badge for an event I did not attend. Can you please help with this?
Thank you,
Have a Happy Day,
MsRowdyRedhead.I will let you guys know their response, in case someone else wants to remove the badge.
HERE"S THE REPLY..

Dear M
Thank you for your email from 02/13/09 regarding our web site.
Have you read the FAQ’s in help section? We update this area on regular basis. As you can imagine, any web site is a work in progress! Each day, our web site developers are making many changes to our site so that it better suits the needs of our consumers. Tips and tricks on how to play My LEGO Network can be found on the Message boards. Here you can join the conversation or just follow the discussions in the different topics.
Thank you again for contacting us. We wish your family many happy hours of creative building with LEGO brand toys in the years to come.
Moira
LEGO Direct Consumer Services