Be prepared to run if followed. If accosted by someone in a car, run in the opposite direction that the direction the car is going. Avoid unlit driveways and other shadowed places. If necessary, walk in the middle of the street until you reach a better lighted street. Don't wear your badge or carry your convention material with you outside the hotel.
Obvious conventioneers are prime targets for thieves.
Try to look as though you belong. Walk with another person when sightseeing or shopping, particularly at night. Carry your wallet in your inside coat pocket if you are a man. Your rear trouser pocket is an easy target for pickpockets. Carry your wallet in a coat pocket rather than your purse if you are a woman.