The 2017 Putnam examination was given on Saturday, December 2, 2017; UBC had 17 students participate (as well as graciously hosting two University of Waterloo students who were working in Vancouver this semester).
Putnam practice sessions are held every Tuesday from 12:30–2:00 PM during the fall semester; they will start again in September 2018. (Details will be posted in early September.) The faculty advisor through 2017 was Greg Martin. The math department's Putnam FAQ has more information, as does the official Putnam web site.