I came across this small set of vintage cocktail pics, apparently taken in Late 1960's San Francisco at a semi-formal party of some sort.
The first—dated June '69—epitomizes everything I would've loved about 60's San Francisco: omnipresent smoking, endless cocktails, and bay windows.
The remaining three snapshots are clearly from the same party, although they're dated Nov '69. It looks like it could've been a New Years celebration—since these cocktails are, to be more precise, glasses of champagne.
Perhaps it was New Years 1968/69, and everyone was too stoned to develop their pictures until six months later? It was the tail-end of the Summer of Love, after all.
I love that whoever lived here hung a print of the Mona Lisa over the piano.
If you recognize anyone in these photos, feel free to tag your friends, you crazy kids, you!
*** UPDATE 06/15/16 ***
Reader AZ informs me these photos were taken to commemorate a graduation by the San Francisco State University Russian Department.