Ok, I have a theory. I think the Trade and Play event will actually be the 17th; the same day GameStop starts selling the Celestial Storm build and battle boxes. Past Trade and Play events, from what I can see online, you had to pay to play because there were prizes and you built your deck from a build and battle deck like a pre-release. This timing is more in keeping with when the promo event was done under Toys R Us, about two weeks after the set release.
I guess we'll see what happens.
Now if you'll excuse me, I need to get back to my room full of news clippings stuck to the wall with bits of red string connecting them.
The event was held today at some GameStops. I called a bunch and only one was holding it. All the stores have Groudon but none of them besides the one had the trading event going on. I have no idea if the store that was holding the event had Treecko or not.