Buddha's Descent From Tushita Heaven

The twenty-second day of the Ninth month of Tibetan calendar, which is the sacred day of the celebration of the Buddha's
descent from Tushita heaven.

Buddha's mother, Maya Deva, was reborn in Indra's heaven after she died. To repay her kindness and to liberate her, and
also to benefit the gods in the heaven, Buddha ascended to the heaven where he preached before the divine congregation,
including his mother, for three months.

In celebration of the great occasion of Buddha's descent from Tushita heaven, pujas to pay homage and make offerings to
Guru Shakyamuni Buddha and the Sixteen Sthaviras are usually held.  Participating in the auspicious puja would bring
powerful waves of inspiration and blessings, accumulate merit and purify obscurations.