There have been some late season drives that have occurred in the last few years, but they have been pretty spontaneous. One was a drive out to Lake Quinault on the Olympic Peninsula, with 3 camaros, for example. Depends on whether or not you plan on using your car in wet weather or not.
Even though I don't have my Camaro anymore, I'll still be putting together a cruise to Winthrop (4th Annual) next year in May sometime. I'm going to try to make it a little later in the month because the pass has been closed late in the season twice now.
Regardless, people post up spur of the moment stuff here too...so just keep an eye our...or post up something yourself. You'd be surprised at who might show up