The term 'higan-e' refers to one of the Zassetsu (collective term of the specific days which show the change of seasons other than the twenty-four divisions of the old calendar), and the seven days around Spring Equinox Day or those around Autumnal Equinox Day.
「彼岸会（ひがんえ）」は、雑節の一つで、春分・秋分を中日とし、前後各3日を合わせた7日間のこと。