The gym is one of the buildings on the edge of the drillfield, which is a huge grass field in the middle of campus. It may be marked as the Memorial Gyms on some of the maps.
There will also be a variety of competitions throughout the day on Saturday, including 5 ball endurance, obsticle course, etc. Prizes will be awarded to the winners.
The actual juggling will be held in a full 3-court gym, with lots of room (both to the sides and above).
Free donuts and juice will be provided if you get there before the people who eat a lot of donuts.
For information on local resteraunts and lodging, try looking at: http://www.bev.net/blacksburg/index.html.
There will probably be some crash space available for those on a budget (see the contacts below for more details about this)