54 Tanabata Festival

The story goes that a weaver princess named Orihime and a young hard working man who is a cattle herder named Hikoboshi lived among the heavens. When they saw each other, they forgot about their work, lost their skills and stayed together all day. 

Which angered the Emperor of Heavens for this lack of responsibility and separated them on opposite sides of the Amanogawa River or the Milky Way. But, once a year, he allowed them to meet on the seventh day of the seventh month, modern calendar and around the seventh day of the eight month following the lunar calendar. 

Tradition has it that Orihime and Hikoboshi cannot meet each other if it is rainy, so people pray for good weather and make wishes for themselves at the same time.