From wiki:
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 Way separates 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."Tanabata star festival observed in FukushimaChildren in Fukushima city celebrated the annual Tanabata star festival on Thursday, replacing natural bamboo leaves normally used with polyethylene alternatives because of radiation fears.
A nursery school in the northeastern Japanese city has decided not to use locally grown bamboo as the decoration, and abandoned a tradition of putting it outside the building.
The children decorated the plastic leaves with fancy paper and strips bearing their wishes. Some wrote that they want to play outdoors.
The nursery school chief said all the windows are closed to keep out radiation and lamented that the children cannot play in the open air.
At Osaka's airport...
http://www3.nhk.or.jp/daily/english/07_30.html