“Tanabata, also known as the “star festival”, takes place on the 7th day of the 7th month of the year, when, according to a Chinese legend, the two stars Altair and Vega, which are usually separated from each other by the milky way, are able to meet.
Because the 7th month of the year roughly coincides with August rather than July according to the formerly used lunar calendar, Tanabata is still celebrated on August 7th in some regions of Japan, while it is celebrated on July 7th in other regions.
One popular Tanabata custom is to write one’s wishes on a piece of paper, and hang that piece of paper on a specially erected bamboo tree, in the hope that the wishes become true.” quoted from internet…
In Kobato Yochien, they celebrated it by singing and dancing
They also hang the kids’ wishes at the bamboo tree but I couldn’t find Alya’s
but I knew that her wishes are to become a doctor and makes a lot of Japanese friends (since I told the sensei so to avoid the miscommunication between she and Alya)