#American_Indian_Day  US: the 4th Friday in September
  supertype:  particular_day__day  a day assigned to a particular purpose or observance; "Mother's Day"
  part of:  September__Sep__Sept  the month following August and preceding October
     part of:  Gregorian_calendar__New_Style  the solar calendar now in general use, introduced by Pope Gregory XIII in 1582 AD to correct an error in the Julian calendar by suppressing 10 days, making Oct 5 be called Oct 15, and providing that only centenary years divisible by 400 should be leap years; it was adopted by Great Britain and the American colonies in 1752
     part of:  autumn__fall  the season when the leaves fall from the trees; "in the fall of 1973"

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