[CSX 4133]

Dominik,

The Shelby American Museum in Boulder should be on your list. The Mecum & Barrett-jackson car auctions can be enjoyable, even as just a spectator.
SAAC 43 is in Northern California, and will be using Sonoma Raceway for the driving portions. Speaking of driving, in the fall there is a huge event called the Rolex Monterey Motorsports Reunion. Hundreds of Historic cars will race on Laguna Seca, plus there are plenty of other car related activities going on at the same time. Pebble Beach and Amelia Island are two major Concours D'Elegance events you might check into as well.
One other suggestion is in your travels plan a day driving the Tail of the Dragon, 318 turns in eleven miles. I suggest you avoid it on the weekends if possible, it becomes rather busy at times.
Once you have dates tentatively set I'm sure you will get more ideas thrown at you. Have fun in the planning stages. Cheers!

~Steven