If you are thinking of doing this at director park, you might want to pick somewhere else. While I didn't see any posts about why we couldn't use pioneer courthouse square, I keep hearing it is being used during the convention. So due to lack of any real info, I looked it up myself. It appears some sort of LEGO Games Tour is going to be at the square. I went to their website, which unlike pioneer courthouse square's website that says it will be 9/4-6, and the lego event is suppose to be 9/3-6 AND also using Director Park along with the square. I don't know what all is going to be set up, or how much room is taken, but it is unlikely that the park is a good place anymore.
On the plus side, this lego games tour thingy should be something interesting to do in the off time. I have no idea what they are showing (other then they are advertising some new lego game you build yourself and can modify a bunch,) but it better be good to take up our space >.< Also, for those of you who like art there is Art in the Pearl happening just a few blocks north of the convention on 8th street. I went to this a few years back and it was pretty cool. It takes place in the green space between 8th and Park Ave (9th street.) Here is a link to take a look.
(The saturday market fair is going on during the weekend too for anyone interested, head to the waterfront and go north and you hit it)
http://www.artinthepearl.com/index.php