I think if you're really pushed for last minute stuff a freezer/refridgerator can do a bit of shielding electromagnetically as long as everything is placed inside without touching the sides?Copper is the best format aluminium is o.k. also.
http://www.endtimesreport.com/faraday_cages.html
http://forums.makezine.com/comments....scussionID=752
http://en.wikipedia.org/wiki/Faraday_cage