If you are trying to find someone to talk to in a room full of people you don’t know, look for someone standing alone. Odds are, that person doesn’t know anybody either, and will be grateful to you for introducing yourself.
Bad breath will ruin a first impression. Always keep some mints or breath strips handy, so you can pop one before a networking event. Don’t chew gum at an event, however.
Chewing gum while talking makes a person seem immature and unprofessional.