I'd say yes. Typically you don't linger over a meal in the park as you would when going out to dinner at home. If you were going in mid-July I'd say you would probably only have standing room left for the Fantasmic show with a reservation at 6:50. However, by August 31 Florida schools are back in session, and many families in other states are gearing up for the return to school within a couple days. I'd venture to say you'll be perfectly fine.