weerover-
Do, meaning a party, show, military engagement, etc. is heard in America as well as in UK. The usage was noted in 1824, J. Briggs in "Remains." (OED) Also spelt (spelled) doe and doo.
I guess do's does it for the pl. Indeed troublesome.            

"Ode on a Grecian Urn."
Apostrophizing rhetorically has always boggled my mind. English, she is most peculiar!
The poem here: http://www.bartleby.com/101/625.html