I went to Odaiba where is large artificial island in Tokyo Bay across the Rainbow Bridge from central Tokyo.
Every summer there is a big festival by Fuji-TV company.
In this year’s event is “United States Of Odaiba” from 17th of July to 31st of August.
Please check this web page and you can image what is there happen.
I recommend to visit there if you have time
Odaiba is one of my favorite place in Tokyo. There are a lot of shopping place, restaurant and nice design building.
You can go there by Yurikamome line from Shinbashi station and across the Rainbow Bridge
Have a fun!!!