Paul Johnson has put together a robust call to action in his blog post about Drupal Business Day at http://bit.ly/UlLteN which makes for entertaining and informative reading.
The basic gist is we need to sell a minimum 15 more tickets by this Friday January 16 for the day to go ahead, so there's no time to waste getting the word out about it. Paul's post has a load of tips about how you can help so DrupalCon Sydney is really about "Growing Drupal Downunder" to a new base of users.
At only $195, Drupal Business Day is amazing value for a fully catered day of interesting case studies and Drupal experts sharing their experiences.
Don't delay if you're thinking of attending, and grab your tickets now at http://sydney2013.drupal.org/register/drupal-business-day

Comments
A quick correction on the
A quick correction on the date to register for Drupal Business Day - we need minimum attendee numbers locked in by this Friday January 18 to secure the room booking.
If you're already attending DrupalCon and planning to attend Business Day, it's ticketed separately, so please register at http://sydney2013.drupal.org/register/drupal-business-day
If you'd like to help get the word out, please post the following message (or your own version) on Twitter and any other social networks that are relevant:
"Learn about #opensource strategy and #Drupal best practice for enterprise at @DrupalCon Business Day on Feb 6! http://bit.ly/T1jMH7"
Thanks!