During the sessions, run by Action Halifax, they worked on a range of activities on conflict resolution and creating world peace.
The group, aged between 14 and 19, met peace expert Prof Paul Rogers, of Bradford University, which supported the course, and Colin Parry from the Foundation for Peace in Warrington.
Dipika Kaushal, of Action Halifax, said: "The aim was to enable the young people to look at global and historical issues and solving those issues and tensions within their own communities."
The course was funded by Calderdale Council Community Services through a Department for Communities and Local Government grant.
The students made a current affairs video at the National Media Museum, Bradford, and took part in Councillor's Question Time based on their own version of the Prime Minister's weekly grilling.
Visiting a Jewish community centre in Leeds was the highlight for 14-year-old Usman Ali.
"It was really interesting to speak to all the older Jewish people and learn about a different culture," he said.
The group also met people at a West Indian community centre.
"I would definitely recommend it to other people. I have made so many new friends," he said.
The group planned the graduation ceremony.
Rob Billson, of Action Halifax, said the success of the evening proved the youngsters had acquired a range of worthwhile skills on the course, which is the first of its kind.