The firm I work with threw the annual Christmas party last night. I don't work well in crowds, so I tend to hide behind my pencil. I can carry more comfortable conversation if I'm working on something... that way, when I don't have anything else to add, I don't suffer the awkward lulls that usually follow.
Two Martinis (ala 1965 - gin, vermouth and olives) and I was off to the races. I did just over two dozen sketches - here are twelve of the better ones.
The nature of drawing an active crowd is to pick postures the person keeps returning to. I give a 10 count just observing the person, and can usually pick out their comfort pose. even better if they're latched into a story being told by another person - they will often freeze solid.
As you see, we're a young company - I believe I'm the oldest in the group. Only 5 of the those above are co-workers, the others are spouses and the server with the most interesting hair.
Pencil in Moleskine sketchbook - Click it to enlarge to 800 px wide.