This is for 20 speaking parts and requires some props. Can be easily adapted for more and less children. You can also have non-speaking roles too if it is required. I adapted an idea I saw on biblebasedassemblies.com.
Sonic's Speed Times Tables is a great way to get your children to become fluent with their tables. I use it every Friday morning and I even race the children myself. There are nine weeks worth of question sheets for each of the 3 stages of the challenge. They are completely random. I set a time limit of 5 minutes to do as many as possible, if they complete them they get the certificate. I mark them but it would be possible to peer mark if that works for your class. I have a leader board display in the classroom to celebrate the children's achievements. They move on to the next stage when they have completed the challenge 5 times. My current champion is a Year 5 child who has done the 128 questions in 2mins 41seconds, he will be moving on to the mixed questions in the next few weeks.<br />
You may wish to remove Sonic from the idea and replace it with something that would motivate your children.<br />
I have found this to be highly motivational for the children, they are desperate to get their picture on the leader board and get a certificate in the Friday celebration assembly.
I use this as a fun game to help embed the reading and plotting of coordinates with a mixed KS2 class. The children will need a 10x10 grid. Instruct them to place as many ships as you want on the grid. I have mixed the coordinates where the missiles hit as best as possible. Play it through until there is a winner.<br />
I am sure this can be extended to all four quadrants but there is no slide shuffle function on PPT so it requires manual entry and shuffling of the coordinates.
I use this as a fun introduction to onomatopoeia. I have used it with KS2 but I'm sure it would work well in KS1 too and possibly KS3. The first few slides are obvious with real words for the sounds then the crocodile and chimp are designed to challenge their thinking to associated sounds or non-words. A whole lesson could probably be built around this if more pictures were added.