O-D, that reminds me, we went round to one house but while there were lots of people there was precious little space.
Wearing a sports jacket it was easy to slip one's empty glass in while eating the nosh of a plate and recovering same when the bottle came around.
I also had a niffty little gadget lifted from ISK. It clipped on your plate to hold your glass. Plastic unfortunately, now silver would have been much better.
Oh and don't forget MM, you need two sparkling clean white linen hankerchiefs, and may be a third if you need to blow your nose.