What MissElin said is true. I live in Tokyo and I've only seen a couple of billboards, much less the ayu trucks driving around blasting music.
Those store names with the A logo are not for You Were.../BALLAD promotion I think. It's just a collaboration for CDL, lasting only 2 short days, 30th and 31st. During those days, the 5 stores in collaboration will change their names to include the A logo, and sell special T-shirts with the store name on it.
Why anyone would want a plain white shirt which says "Tokyu Hands" on it, even with the changed A logo, I don't know. Lol!
Anyway, those who visit all 5 stores and collect 5 stickers can enter a lucky draw during CDL, which entitles them to win a special mug or mini-towel.
Just my opinion, but I feel that the event was just a massive effort to drain money from fans. You run around downtown, pay close to $100 to get 5 shirts, and the reward is just a cup.
