I saw the parade/show/party last Thursday. We sat at the old ABC theater on the curve end of the stairs.
The "Bash" stops and performs twice. The parade starts at 3pm and makes it to the second location around 3:20pm. It starts at the front of the park and Stops at the end of the street. After it finishes there, it drives around and stops between the big hat and Star Tours.
It is basicly three sections-
1 Toy Story
2 Monsters Inc
3 Bugs Life
The first stop would have Bugs Life near the front gate Monsters in the center of block and Toy Story at the end of the block near the big hat.
The second stop has the same order, Bugs near the hat, Monsters near the old ABC theater and the Toys up near Star Tours.
I hope this helps. Where we sat, we were at the front end of the Monster float.