For primary students try these games (disguised language drills)
They have the benefit of including many students at once with minimum time waiting for a turn. They are designed to allow for frequent repetition of vocabulary or a sentence containing a grammatical structure that you would like to practise.
Easy classroom vocabulary game
Simple and easy to implement.
and
Kidnap, great game for large classes
More complicated in the full form but it can be done in two stages over different lessons. It's a hit with students.
Enjoy!
Shelley