In Japan, today,7/7, is a day called Tanabata.

"Tanabata (七夕, meaning “Evening of the seventh”) is a Japanese star festival, originating from the Chinese Qixi Festival.

It celebrates the meeting of the deities Orihime and Hikoboshi (represented by the stars Vega and Altair respectively). According to legend, the Milky Wayseparates these lovers, and they are allowed to meet only once a year on the seventh day of the seventh lunar month of the lunisolar calendar. The date of Tanabata varies by region of the country, but the first festivities begin on July 7 of the Gregorian calendar. The celebration is held at night.”

More information, visit: http://en.wikipedia.org/wiki/Tanabata