I do not know where you are starting from, but the North Channel trail (not North branch) will take you to the Green bay trail. The Green Bay trail will take you to the McClory trail up in Lake county. the McClory trail goes right past the Ravinia Music festival grounds.
the changeover from the the North channel trail to the Green Bay trail is a bit tricky, but once on the Green bay trail, all you have to do is follow the signs.
I found it with a bit of searching on Google maps by simply scrutinizing the photos. If you do a search for any of those trails, you might find some more comprehensive maps.
The Green Bay Trail starts at the Wilmette Metra station and more or less parallels the UP North Tracks all the way up to Ravinia. How to get there depends on where you're starting from, but I like California.