I figured I would put in my $.02 by suggesting the LA Auto show(at the LA convention center). iI runs 5-13. Personally, I am heavily leaning towards the weekend of the 5-6(the next weekend I may be in Vegas).
Available in December at participating Chevron stations and new car dealerships. Valid for $2 off one regular admission. The coupon is not valid on Saturdays & Sundays 12-4 PM (discount is valid all other hours and days).