The White House Christmas Tree lighting ceremony is scheduled for tomorrow, Thursday Nov. Dec. 6, at 5 p.m., which means without a doubt, if you can avoid driving your car in the city, you really should. The annual ceremony always screws up downtown traffic in an extreme way. Add the leftover snow and ice on the ground into the mix, and we can promise you a traffic clusterf*** of epic proportions tomorrow evening. If you’d…