@Jon T asked "Should a small oriental rug be added to the list of things to always carry with you? You know, so as not to sully the driveways and such of friends and celebrities we visit?"
That's actually an interesting question for which there is probably not a ready answer. I suspect that @Marty Grzynkowicz might have one stowed discreetly, but these days, with his leanings towards Italian cars it has, I suspect, been changed from Oriental to an Italian Rosso or Dalia. It's always best to compliment the car make with the drip rug.
If we're out on a "Cruise Day" we're probably not stopping anywhere long enough to worry about a wayward drip. Days like that, for me, mean gravel or gravel/grassy parking areas at best and the longest we'll be hanging around is over lunch, so for that I wouldn't bother.
The opposite instance might be at a car show or cook-out for your local club members and then you kind-of have to judge the host's/hostess's mind-set. I've been to gatherings near Boston where the host offered (and it was impolite to refuse his offer) individual drip shields for attendees, both original 356 and replica, to shield his precious, hand-laid, polished granite, cobblestone driveway from our dripping terrors. (To be honest, here..... I have no idea if mine drips that much or not but he's actually a nice guy so, since he knows I drive a replica, I asked for two. And his driveway probably cost more than my entire house.) In this instance, offering to use your own Oriental Drip Rug instead of using his known-absorbancy drip shield might be taken as an insult, so play that card carefully.
Other times I've been to club gatherings where the host is a true "Cah Guy" and doesn't really care what his driveway looks like. He's more interested in showing off his small collection of much sought-after, rare German ferrous oxide and the custom carriage shed that cost three times my house that shields his toys from the elements.
OTOH, at my house I have a short asphalt driveway with a cheap Home Depot sealer top coat and both my Speedster and Nissan Rogue have leaks (Gasp!) so I could give a Rat's Pitootie what the heck is leaking out there. Still, I could only fit 4 - 5 Speedies in the driveway - The rest would have to park in the street and I don't care what leaks out there - especially after the trash truck goes through.
So to answer your question, bring it along if you must, but don't expect to use it.