Just a note to anyone that's unsure of whether they should bring their 'lower end' gear or not - YES!!!
While there is some extremely expensive and high-end gear at these meets, there's no elitism or snobbery. The reality is, as much as most of us would like to, not everyone is in a place to buy $500+ headphones. So this is a great chance to find both your cost-no-object dream setup as well as your obtainable-right-now setup.
Additionally, even if you own a $1000+ pair of cans, it's still nice to have say an M50 to take out on the streets and not worry too much about. No one says you can only have 1 pair (and my wallet cringed as I typed that). I love it when you stumble across something that performs well above its price point.
Hope I can make it!