I leave for Orlando on Friday, and I spent a few hours last night making up a spreadsheet with times. I've got the info for the 12th through the 17th, and Fantasmic is shown each night at 9 & 10:30 except on the 13th (only shown at 9). The only one of those days that's an evening EMH is the 12th, so unless you're going that day, you don't need a band to stay late.
They always did this when I went in previous years in the summer, and from what I remember a lot of the shops on the main street and on the street where TT, RnR and Fantasmic are located were still open after the show. Not all, but a lot.