The Tanabata Festival happens once a year in Japan between July and August on the seventh day of the seventh month on the lunisolar calendar. The festival is commonly celebrated today by writing wishes on slips of paper which are hung on bamboo.
Polar Bear’s cafe
This festival is depicted in episode 13 of my new favourite kawaii anime: Polar Bear’s Cafe! Follow the adventures of Panda, Polar Bear, Penguin and friends as they meet at Polar Bear’s cafe and hang out with their friends. I also love the opening credits for this show which I think are the cutest anime credits I have ever seen!
More information about Tanabata on Wikipedia