I'm sure both my therapist and I would enjoy doing something special, but I personally don't know exactly what our anniversary is. I could look up my first session in my diary - I know it was in June 2010. But before that I had worked with the same therapist in a group for about three months, so I'm not sure which day really counts as the anniversary. We do special things now and then though to celebrate holidays or just therapy, so I don't really feel a need for an anniversary.