Geez FL410, I've read plenty of your posts, you're far from having the right to be critical of anyone's grammar.
To the OP, first off, casually late is great for your friend's party, but I would try to be there waiting when the doors open. You want to demonstrate that you can be punctual and you're eager to meet with them. Don't worry about your current employer seeing you meeting with other airlines, it is a job fair. They of all people should understand it's business and not personal.
I've never been to a job fair but I would assume they will ask some interview type questions as a way to qualify and screen applicants. A business suit would be the appropriate attire and it sounds like you have that covered. Good luck!