I've been asked to do crafts with a group of 8 or 12 teenagers once a week in the run up to Christmas. I've a few craft ideas for other weeks but as I can't remember the last time I did anything halloweeny, (having no children and living in flats with older people means that Halloween night never happens here.)
I just realised that I had no idea what to make with them. The session lasts about an hour and a half.