Although I've taught the basic public international law course a couple of times, and the connections to Internet Law are obvious, I don't consider myself a mainstream international lawyer. This will be the first time I go to an ASIL meeting. A number of the panels are about things I am particularly interested in — arbitration, terrorism, detainee related issues — so I'm looking forward to learning stuff and meeting new people.
I suspect that the atmosphere will be more formal than most of the events I go to these days. I tend to go to tech events and conferences that are held in inexpensive venues and where people wear t-shirts. (Or, occasionally, that are held in lovely, expensive venues, but people still wear t-shirts.) The ASIL is meeting in a very expensive venue, in the heart of Foggy Bottom, but it being DC, and the attendee list full of international judges, I'm expecting this is a suit environment.