This is a really great activity to get your kids to watch you closely! It is so important, especially on the day of your primary program, for them to watch you so they know when to stand, sit, sing louder and softer, etc.
Start by telling them that you will be playing Simon Says. If they don’t know how to play, then give them an overview with a few examples. In this version of Simon says, only the silent actions you do should be followed, while the direction you say out loud should be ignored. For example, if you raise your hands to indicate that they should stand then they should follow you, and stand up. If you then tell them out loud to sit down, they should stay standing, because only your silent actions should be followed. Encourage your primary teachers to play too, because the kids love it when they do the right thing and the teachers make little mistakes!
This is a really great no-prep activity that will keep all of your primary involved, and give you a great opportunity to be really clear about what your actions mean! Make sure to be extra clear on what each signal means before you start, especially with junior primary, and the longer you keep playing, the more familiar your actions will be to them. You will definitely want to include one for standing and one for sitting, and you may want to consider one action that tells them to get on the edge of their seats so they are all ready to stand together. You can also include some actions for singing louder or softer, faster or slower. Once you’ve played a few times without them singing to make sure they understand the actions you’re communicating, play with them singing a song too, and continue to shout out directions. I have found that it’s much harder for them to remember not to follow your speech when they are singing! And be sure to be really insistent with what you say too, and keep repeating it a couple times if your kids are really getting the hang of it. I would probably play more rounds of Silent Simon Says without singing with Junior primary, and more while they’re singing with Senior.