If you attend the DVC member meeting @ VGC, do they let you park in the VGC parking lot, or do you have to use Mickey and Friends or Downtown Disney parking lot?
I don’t see why you couldn’t park in the Grand Californian parking lot across the street. It is also used somewhat by people at Paradise pier Hotel and Disneyland Hotels. You will probably need to pay for it, but when you use points to stay at grand Californian you don’t need to pay for it
The GCH/PP self-parking lot is always pretty packed, so I wouldn’t plan to park there. Perhaps MS can give more information as to whether they’ll validate your DTD parking...?