Don't know if you're familiar with Leonard Lopate and his show, "Please Explain." It's an NPR talk show in the States, and he has guests who explain about procrastination, insomnia, hair... just about everything. There was one on mingling, which might give you some ideas how to teach students to make small talk.
Here's the link:
WNYC - Lopate - Please Explain (page 7)
Good luck with the lesson.
Chris Cotter
Heads Up English - Just print and teach!
Heads Up English