Oh, I do know about Edokko, but the way "Ooedo" is usually used is different from just "Edo" in general or Edokko. Like, I usually see it used more specifically for old fashioned themes (or at least related to traditional Japan). Now I'm curious if those other usage of Edo also specifically use "Ooedo" ?
When I see books or events called Ooedo-something, they're usually all about classical or traditional Japanese things that are being featured. Traditional food, traditional paintings, ukiyo-e, daily life of the Edo period, etc. So the exhibition/fair in the story, I was thinking the product does not have to actually something from the Edo period, but I had thought maybe it's all about tradition, and maybe it won't be exhibiting modern things like electronics in there.