重阳节开展英语：Double Ninth Festival。

例句

Double Ninth Festival falls on the ninth day of the ninth lunar month, it is one of the popular traditional Chinese festivals. 

重阳节适逢农历九月初九，它是流行的中国传统节日之一。

According to Miscellany of the Western Capital written by Liu Xin in the Han Dynasty, as early as in the West Han Dynasty, the practice of wearing zhuyu and drinking chrysanthemum wine on Double Ninth Festival was popular, arid it was considered beneficial to people's health and conducive to longevity. 

据汉代刘昕记载，早在西汉西方资本杂记，在重阳节戴茱萸、喝菊花酒的做法是普遍的，有人认为这对人的健康有益，有利于长寿。

Tomorrow is Double Ninth Festival, Wish all the old people a happy holiday!

明天是九九重阳节，祝愿所有的老人节日快乐！