I'm not sure about hours in October, but we have gone many times with shorter hours and missed parades because we've ended up park hopping during that time - I hate that! (With shorter hours, I have never felt we could take the time to go back to the resort. ) With a larger group like yours it may be harder to get everyone to agree they want to see a parade! Parades are not a priority for my DH. We finally do what TJ suggested. Pick our priorities and alternate days doing things. Overall though, if the parks close at 7 we have never found the need to "rest and refresh" mid afternoon by going back to the resort. (We usually just find a nice airconditioned tavern on site - LOL) If you plan a late lunch at a sit down restaurant that could probably serve the same purpose.
P.S. Last time I really wanted to see the AK PArade, which seems easy to miss becuase it's late in the afternoon and we usually try to do AK in the morning. Anyway, DD and I left Epcot (WS) at 3:30 PM, ran to the car, drove to AK, ran into the park. Had just enough time to get a cold drink and settle in about 15 minutes before the parade. Watched the parade, ran out, back to the car, back to BWV, the boat to Epcot and met DH at Germany at 6:00 just in time for our PS. Not something I want to do every day, but it kept everyone happy!