I have always been to these things for family, in my career, et cetera where the entire experience is whole-group and they're always really cute... finger plays, songs, poems, even prayers... but they're always insync, whole group and I've never had an expectation of anything different.
Then I attended one last year where the students were able to do one little piece individually, and it made all the difference! I know that was scary for the teacher, probably, thinking what if none of these kids are brave enough to go up to the mic alone and say their part... some adults won't even do that!! but the kids in this little church preschool ALL did it, some quieter than others, but they all did.
Maybe consider something like this, even if its just introducing themselves to the crowd. It is an important skill, public speaking is, and it can never start too early.
This teacher had her kids each walk up and say A is for Apple or B is for Balloon or whatever, each student had a letter. You could even make as many of them as possible have a letter in their name.