Also, why would there be a unique schedule on July 4th? I understand daylight savings, etc, but why the 4th?
Holidays like Memorial Day or Labor Day aren't good news for ratings, so they'll often air something other than the regular 'premieres'. (usually rerun marathons)
Here are the ratings for the '4th of July weekend' the past two years - last year's schedule was tweaked slightly for the Space Dandy S2 premiere. This year is more interesting/problematic (pick your adjective) because the 4th lands directly on Saturday night.