I've attended every year. Never presented. Still, as you asked for advice of people who attended, here I go.

Little tidbits I've seen people struggle with before:

*Avoid using anything wireless. Wired only. *Make sure people can identify anyone working in your booth, at all times (both in and out of the booth). The most common way for this is for everyone to have the same tshirt with their game logo/title on the front and back. *Cards, flyers, and buttons are all very common..and are at every booth I've seen. If you want to draw attention, add something different and give it to people that play your game. If you have ANYTHING that people will play with/carry around and could get people to ask "Where did you get that?" foot traffic will increase to your booth significantly. -Examples of the above from past years include: wizard hoods, inflatable/plastic weapons, bags, posters, shirts, hats, mugs, steel water bottles, plushy toys of their characters, bouncing lightup balls, flashing blue LED pens, face painting(?seriously), The One Ring(LOTRO gave me this one, with incription on the inside and a chain to hang it around your neck), free copies of their game (LOTRO deluxe box, Don't Starve, Magicka, Borderlands The Pre-Sequel were all given to me free at PAX East) *Be able to describe your game in one short bit. Like "You get in the pit and kill eachother" kind of simple. Don't describe the game design or concept unless people ask. They can see the game in front of them, and they will be seeing hundreds of games in a short time frame. The only things they likely care about are "What is the goal?" and "Is it fun?" *You will probably lose your voice over 3 days of trying to talk loudly over the constant noise of PAX East *Make sure people can hear your booth, and make sure it is as OPEN as possible, to be viewable from as many places as possible. Don't put yourself in a situation where people are going to block off view of your game from people walking by. Have at least one display higher up that they can see. *Don't let people play too long. If there is no time limit on games by default, have the game give a message after an amount of time thanking them for playing or something similar. Make sure people know how long they get to play ahead of time, and make sure the people in line know the wait. *You will have tens of thousands of people passing by your booth over the weekend. Don't ever forget that. Prepare for it. *Please don't do email signups/facebook signups. It causes unnecessary lines and becomes a barrier between you and the people that might be interested. *It's going to be grueling. For you and for everyone else. You will be tired, they will be tired. Be friendly all the time, you never know who you are talking to. *ALWAYS have cards/things to hand out WITH you at all times, not just at your booth. *Consider making a QR code for your greenlight page. Everyone has smartphones that attends these things. *Try to manage crowds that build up..don't let them block your booth to prevent people from seeing or approaching, and don't push lines out into the walkway if you can help it *With the above, take special note of who is around you. Their crowds can cause problems with blocking off view of your booth too from major walkways. PAX Enforcers will try to help, but they are always overwhelmed. *I've never seen anyone use a projector successfully at PAX East. Take that for what you will. *Game looks neat, I'm sure you'll do fine! Good luck!