Hi There
I haven't been on this site for a while. I would say have a professional discussion or observation/witness statement. Even though you only volunteer once a week i'm sure you do these things with out realizing. I too am in the school once a week but do find my self doing quite a lot. When i talk to the teacher and ask about tasks i need to do she always says "well you have just done that" Its only when I reflect back I think to my self Yes I have .
Is this for assignment 5 ? I have just started this.
How are you finding the course?
I hope I have helped in some way although you may have already done this.