Carry plenty of $1 bills. It’s customary to tip the baggage handlers at the airport, the taxi or shuttle bus driver, the doorman, and the bellman – and that’s all before you get to your room!
Also remember to bring some smaller currency for purchases at vendor exhibits. They may not be able or willing to use all their extra currency to make change for smaller purchases. If you are planning to do research while in Kansas City you will also want to bring coins and small bills for making photocopies.
If you plan to make purchases make sure to have room in luggage to take it home with you. An extra suitcase or tote bag may come in handy.