Unlike the USA, we're lucky enough we can even get the chance to experience the Wii, even if it is just 5 days prior to launch. Yes if it would happen on this weekend it would have been much better, heck all over Canada would have made it alot better.
The funny thing is that we might even be able to test out the Wii even before this event, all we need is one of our local videogame-selling stores to have those freakin' dev units.
However, what if in this event they have playable demos of Metroid Prime 3, Wario Ware, Cooking Mama, or even WiiPlay, I still think it is worth going just to check the possibility of being able to try these demos way before they come out.