Found this idea on a chorister blog and it was SUCH a huge hit! Kids and teachers were talking about it days and weeks after. And what's great is it's simple to prepare and execute, the teachers are the main ones "on display" so it gives you a little break, and the kids have to SING in order for the game to work!
The sign I made to tape up onto the podium (I like signs!):
I had five teachers to come up front and sit in chairs facing the kids.
They were each given a piece of paper that I'd put together, each paper different.
Here's an example:
So we had five teachers sitting in chairs facing the kids.
We'd start singing one of the songs and the teachers would quickly look at their paper to know which word they were supposed to do an action for. This also tested if the teachers knew the songs!
As you can see there are blank spots on the above example. Not every teacher had a word assigned to them for every single song because frankly it was hard to think of actions for them to do!! But it worked out; the kids couldn't necessarily remember more than a few actions/word combinations per song anyway!
The kids did great at paying attention to what the teachers were doing, even while singing! It was a blast!
EDITED TO ADD FOUR PAGES FROM A SINGING TIME I JUST DID. You can see how each one is different, one page was given to a teacher. Four teachers total, different words and different actions. A few didn't have a word for that song since there weren't enough repeating words.