As a logo this doesn't work very well. I think this would make a great poster or flyer though. You would obviously need more information on the event, but I do think it would work.

1. As Nate points out, I don't think that will work as a logo.

2. I think you worked the idea of Urban into the design. And now perhaps, you can find a way to work the idea of Challenge into it. Maybe some symbols that will say adventure, competition, etc.

Is that a logo or just a sketch?

Same thought as other reviewers... You could keep this concept as a basis for a poster maybe, although it is actually a bit hard to read, but as a logo it doesn't work. I like the star in the window, I would focus more on that... and make the concept include some 'dream' feel, 'make a wish' foundation is about trying to bring some happiness into kids lives, but this city looks dark and gloomy...

but i guess u need to rearrange the graphics...its not looking well like your concept..

As a concept, this could be good.... It's just not done yet. The focus is on the big black buildings instead of the wording at this point, and is a bit too big & blocky. Maybe try to find a way to incorporate the buildings into the text instead of the other way around.