To answer your first question: It depends on what day and what time you arrive to pick up your badge. If you pre-registered, you can come on Thursday to pick up your badge. If you are not pre-registered, you can buy your badge on Friday. Peak hours are usually in the morning-to-afternoon. Generally, depending on the line, it takes about half an hour to an hour to receive your badge. Your experience may vary, however.
To answer your second question: There is a capped limit of 2,000 attendees. Last year, we had just over 1,800. It is held on one level of the Wyndham Hotel, which makes it slightly crowded and cramped. However, we set up a tent next to the Wyndham, to give us extra room and more programming space.
To answer your third question: Basically, you need your badge to be able to attend PortConMaine. It must be visible at all times. If you do not have your badge, then you cannot access the convention at all. So, the first thing that you'd want to do is get your badge. Once you receive your badge, feel free to check out whatever catches your eye, be it the Dealer's Room, Artists' Alley, video game room, panel rooms, etc.. Along with your badge, you will receive a bag that will have a Program Guide in it. This Program Guide contains all the information you need to know about PortConMaine. There will be a map of the convention area, schedules of all four days, a list of panels and what they are, a list of video programming that will be played, etc.
I hope that answers your question. If you have more, feel free to toss them to us and we will gladly answer them.