Roles for young volunteers

Hi everyone

I have plenty of young people who are keen to volunteer but I am now running out of suitable roles to place them that fits around their school hours. They are currently volunteering in A&E and helping out at meal times and befriending on some of the wards. I have looked into Meet and Greet type roles at weekends but currently I am told this is not needed. Does anyone have any suggestions for other roles that young volunteers can do at weekends?