I look back & previous months to see what days had what emh. It's not always 100% accurate, but it gives an idea of what to expect.
We do morning emh & plan a late bfast (10:30ish) or early lunch (11:45am) on those days @ the park that has the emh. For the evening emh, I plan to eat @ the emh park or if its MK or Epcot a resort ressie.
Good Luck!!