This thursday they'll be at the farmers market in northville running an "instrument petting zoo". It's designed to expose kids to a variety of instruments and let them watch, play and touch different instruments. It's free and for all ages. I believe there will be a small ensemble performing as well.
Here are the links with more info:
Taste of music: http://www.a2so.com/family/
Northville farmers market: http://
"Enjoy the Brass Quintet at 11:00 am - 12:00 noon with an Instrument Petting Zoo before and after the performance."