Disney have extended the hours for Epcot in September on Friday and Saturday evenings by one hour. This is for all guests and not just EMH for hotel guests.
This is probably due to the ever popular Food & Wine Festival where Friday and Saturday evenings can be extra busy.
Epcot - 9:00am - 10:00pm on the following dates...
Friday 1st September 2017
Saturday 2nd September 2017
Friday 8th September 2017
Saturday 9th September 2017
Friday 15th September 2017
Saturday 16th September 2017
Friday 22nd September 2017
Saturday 23rd September 2017
Friday 29th September 2017
Saturday 30th September 2017