The difference is that Christmas always comes on December 25th. Car show season is a lot less defined because it starts somewhere between April and June depending on whether you live in Yellowknife, Yukon Territory or Mobile, Alabama.
A pretty safe bet ( based on the MyStarCollectorCar Events Page) is late April to early May.
Take a look at past car shows that gave car guys their own Christmas and take a look at the May 2013 MSCC Car Show Page in this link.
For look back at Past MSCC Stars of the Show please follow this link.