In my case, it's the time before the convention that's the flurry of activity and stress, so by the time the convention actually rolls around, I can get a nice calm floaty feeling.
And yeah, it's that way on purpose.
I've worked at the convention in some capacity for nine of the ten years; the exception was 2004 when I was in the Gulag, and in that case I was only able to help windelina by doing the sound edit for the Invader Zim entry. It was the first time I had done a sound edit completely remotely, and it was pretty cool to be able to do it.
By keeping the majority of the stuff to be completed before the con, it leaves me with having the con as a sort of reward where I can see and appreciate the work that others have put into it. And there are some truly creative folks doing some really cool things.
(Aside: I just discovered how to answer my cell phone with the bluetooth headset. And no, it wasn't obvious.)