My T and I brought in some food (sparkling cider, chocolate, and strawberries) to celebrate the 3rd anniversary of the day we started working together. We did it in her office, discussed that it wouldn't be part of the boundaries to go somewhere. It was nice, and while we were eating it was not like a session in that it was more chit-chatty. We spent about 20 minutes doing this and then 30 minutes talking. THough my T and I do have lighter sessions from time to time and do start every session with lighter chatting, I must admit that it was kind of strange at first because it was a more 'social' activity, which we'd never done. I didn't think about that ahead of time.