If you are interested creating Tanabata decorations, the Origami club site has a collection of decorations that you can make with easy to follow instructions. The Kid Nifty site has some tanzaku papers that can be downloaded for you to write your wishes on. Let's all hope everyone's wishes come true this year.
The Sendai Tanabata Festival is considered one of the three major festivals of the Tohoku region, which is visited by over 2 million people every year. Tanabata is generally celebrated as a national event on July 7th, but the Sendai Tanabata Matsuri is held in August, in accordance with the lunar calendar. Similar events are held throughout the nation, but the Sendai Tanabata Festival is the most famous of all.