1. Navigate to Communities > Special Events > Friends Asking Friends > Kintera Thon
  2. Hover over the event name and select Properties 
  3. Mark the appropriate radio button for "Use Essentials Design Template" or "Use Standard Design Template"
  4. Click Save
  5. Hover over the event name and select Website Info 
  6. Click the green "Publish This Event Now" button to commit the changes

Note: If you have an event that has custom coding associated with it, switching the design template will remove the code.