def METHOD_NAME(self):
    if self._year >= 1903:
        # St. Patrick's Day
        self._add_observed(self._add_holiday_mar_17("St. Patrick's Day"))
    # Easter Monday
    self._add_easter_monday("Easter Monday")
    # Battle of the Boyne
    self._add_observed(self._add_holiday_jul_12("Battle of the Boyne"))
    # Late Summer bank holiday (last Monday in August)
    if self._year >= 1971:
        self._add_holiday_last_mon_of_aug("Late Summer Bank Holiday")