Contact other exhibitors in fields complementary to yours and see if you can do something reciprocal, like joint presentations at each other's booths. (slaw.ca)
After it's all said and done, learn from your mistakes, take note of what worked for other exhibitors, make adjustments, and move on to the next show! (smallbusinessesdoitbetter.com)
Also inquire about what other exhibitors the manager has registered to attend. (entrepreneur.com)