I wish I could tell you the exact location of the ticket shops but I myself can only hope to find them next time if I need them.
4 years ago I could buy 2 weeks in advance Buono! concert tickets for Yokohama Blitz in Ueno shop for a good price so I could go to the afternoon and the evening concerts as well. I will try to find out where it was. Also in Shibuya I just bumped into a ticket shop by walking around. You should walk around there anyway.
In Tsukishima they make monjayaki at every restaurant and you can ask (probably they don't speak English) the waiter to help you. Every table is a working hot plate so be careful. And every shop has photos of celebrities who had lunch/dinner there.
Odaiba looks very nice at night. You can ride the train which has no driver and if you are lucky you can enjoy the view from the drivers seat. Most importantly you can make such photos: https://en.wikipedia...ge_at_night.jpg
I am also interested how the Hina fest goes so I will check the related topic regularly. If I am around I would rather go to a Scandal concert to Shizuoka which is quite trip but this is how the life of fans go. By the way, has anybody visited Shizuoka? I checked out the related pages but I would appreciate some personal insights as well.