Hi,
Teaching 6-13yr olds sounds fun! Kids (and adults) love competitions, try some active fun games. This also encourages Ss to communicate in English and for team work, because they have to discuss and agree on each answer to each task.
In teams. Set them tasks to do in English related to a topic/theme.
E.G. Theme-Human Body:
Each team should have a blank outline of a human body pinned onto wall. (This can be made by each team before the actual competition day, in Art class, can get team to name the blank body, or T draws on blackboard the body outline for each team.)
Tasks:
1. think of 5 body nouns beginning with 'H'
2. what are the 5 senses?
3. complete the human body gap fill; simple wordsearch etc etc.
when all tasks are completed, get the team to label the body with the nouns they have chosen and relate the senses to the body.
1st team who finishes tasks and labels the body correctly wins.
This competition can be for a whole day, u can adapt/change it anyway you like. Just an idea. You have to monitor the Ss closely for good team effort though.
Have fun!
