Having all the items you need to bring with you to an event is only one part of being prepared. If you aren’t mentally prepared, sales will slip through your fingers faster than water falls from a faucet turned on high.
Introverts should accept the fact that live events are interactive. As an author representing your work, you will need to talk to people and appear confident. If this is an issue for you, I recommend walking through a mall and saying hello to every person you make eye contact with. After a few times, you will understand the basics of what you will experience at your first event. Eye contact is your chance to start a conversation with someone about your books. Hello is always an excellent opening for any conversation.