My suggestion is to make sure it is fun as the children will already have spent a full day in school and will be pretty tired of sitting all day at a desk, so I would include some games that involve movement to break up the sitting periods.
Watching movies is a great idea and you could just show the first half or a movie, then talk about it, and what the students think will happen. Don't show the second half till the next session that way the students will be more motivated to show up.
If the students are really motivated to learn English of their own accord it should be relatively easy to keep them happy, but if not you will have to work harder at keeping it fun so include plenty of games. How about some English karaoke!
Hope it goes well.
- English language games for 4 to 12 year olds
- Free story and games for preschool children