My team is about to launch a new web application, http://wethepixels.com, that requires a lot of people to be on the site at the same time for the concept to be successful.

Our team is preparing to promote/market an event for a specific date and time, in order to try to grab a large group of people to the site at once.

For those who have gone through a similar web launch, we would love to hear ideas on the best way to market for a large group in a relatively short period of time. We have created a Facebook page and a Facebook event, but it has yet to grab much attention (surprisingly to us). Is there a better way to attract a large number of users in a short period of time?

Thanks