I'm going to the Wizard New England Comic Con this weekend...
1) This is my first three-day convention...ever.
2) I'm volunteering throughout the weekend (so I can get in free)
3) I HAVE NO IDEA WHAT I'M DOING!!
 
I've read the articles and seen the clips about deodorant, breath mints, fresh clothes and such. This is a big deal for me. Adam West, Burt Ward, Lee Majors and John Schneider are going to be there! 
 
I plan on having my camera with me, and have a list of things/events/panels I want to see, but never having been to events like this I have questions. How expensive is the food is at these things? How can I get into the post day events at local bars and such? Should I bring things I'm interested in selling/trading? Should I wait until the final day to shop/sell/trade? Can I use my Volunteer shirt to have people sign? Should I wait until the costume contest to take pictures? Is it better to leave the con for lunch (or dinner) and then come back, or to buy food there?
 
Any advice from previous attendees at either a Wizard con or SDCC or any multi-day event would be greatly appreciated!