I ALWAYS get the pre-con jitters the night before conventions, whether I'm flying or driving, but flying has its own set of stressors ;)
There's that fear, in the back of your head, that you'll forget something important - like a charging hub, or medications. Well, all such is packed now.
Still, I have that feeling in my stomach, a mix of excitement and dread - which, upon being seated on the plane - or starting on the road trip - goes away. It makes everything real and puts the potential problems and pitfalls in the rearview mirror.
Rach and I arrive at NTRPG Con tomorrow - please say "hello" if you are attending - my joy of conventions comes from meeting members of the community :)