If you are referring to ELP as being the Electrical Water Pageant, it runs nightly regardless of when the MK closes. The only exception is inclement weather. If I remember correctly, it used to be called the Electrical Light Parade, right???
I would check online to see if they are shooting off fireworks. Even when the MK closes early, sometimes they still shoot them off, but not always. The ELP is shown nightly, weather permitting.
The official schedule has no fireworks or Spectro from Apr 24 to May 9th. First fireworks scheduled are May 10th. They may surprise us all and add a night or two at the last minute (here's hoping). Grad nights are April 25/26 May 2/3 and 9.