The school where I work are doing a friendship week near the end of May. Through my role as a Learning Mentor I am involved in some of the activities, and was glad to spot some resources produced by Save the Children.
Go here, register for a pack, which will include:
With teaching suggestions and assembly ideas, a DVD, interactive whiteboard activities and fundraising materials. The pack also contains friendship stories from children around the world and a unique section on how to get your School Council involved.
Look forward to receiving mine and being able to tell you more.