I went there the day after Noah's Ark! I couldn't go up to the Skytree because of elevator trouble the day before, but that didn't affect my chances of touring the strawberry fair!
Solamachi is larger than I thought, so it was quite difficult to find the collaboration stores. The Solamachi Strawberry Fair website says "VEE collaboration target," but there are multiple pages listing the menus, and they're located all over the 1st to 6th floors, so it's probably best to narrow down your options and start from the 1st floor or the 6th floor in order!
Some popular stores have already finished distributing coasters, so I was worried that I might get a glimpse of the shops.

Visiting the Strawberry Fair | 八谷幸's post