Here's an idea for teachers who don't have enough time ...
Have you thought about asking the students to write their own semi-impromptu play? It's a rather popular lesson activity and it gets rave reviews from teachers around the world - at least the teachers I know.
Divide the class into small groups.
Tell each group they're going to create a mini-play (5 minutes).
Each person in the group must play a role, be it a person or an object (or the director who keeps cutting in and stopping the production)
Have the groups brainstorm their topics. (10 minutes)
Have the groups work on writing their dialogues. (10-15 minutes)
Have them practise the dialogue. (10- 15 minutes)
Have the groups present. (30 minutes)
All the best.