Tanabata “Star Celebration”
Otherwise called the Star Celebration, Japan's Tanabata, (Hoshi Matsuri), has its foundations in the Chinese Qixi, "Double Seventh Festival". In contrast to the lunar calendar, it is typically observed on July 7, which is the seventh day of the seventh month in the Gregorian calendar in Japan.
The original story in China is titled, “The Cowherd and the Weaver Girl”, adapted by Japan, as the “Tale of Amewakahiko”.
The Stars Vega and Altair, the two brightest stars in the sky, are said to represent the two main characters of the story, the Weaver girl (Vega) who fell in love with a “Cow herder” Altair. Their love was forbidden by the Weaver girl’s queen mother.
A Tanabata custom is to write your wishes on paper strips called tanzaku and hanging them on bamboo branches.
Sources : (1) https://www.thoughtco.com/the-myth-of-cupid-and-psyche-117892/
(2) https://www.youtube.com/watch?v=s_TGkDcjBqI
amewakahiko