Looking for some warm up ideas for an elementary school English day.

Every year our city holds English "parties" in numerous schools in the city. These parties involve 12 ALTs meeting up in one school, and then the students complete activities in small groups with the ALTs.

I am looking for some ideas to use for warming up the students before they get into smaller groups. I've tried searching and AI, but I'm not finding anything useful.

There are roughly 100 students in each elementary grade.

Usually we just warm up with the stereo game, whereby 4 ALTs simply answer a question at the same time.

I was hoping someone might have something more fun or some interesting ideas for involving 12 ALTs and 100 students at the same time. Ideally, they would have some kind of communicative element.

The warmup should be for around 10 minutes – I need ideas for all grades 1-6, but they can be different for each grade.

(Christmas-related ideas would be especially useful.)

Many thanks for any suggestions! All are gratefully received.

by SamuraiCatNinja