I too will attempt to make it there. This is what I can bring along:
-Bottlehead S.E.X with C4S/impedance switch mod
-HE-500s with jergpads + Norne cables (if they arrive in time)
-DT880s (250 ohm)
-Aune T1 that I've almost never used if anyone is interested
What's going to happen source-wise? Will there be a couple there and just a lot of amp/dac swapping?
For the previous meets, most people with a large setup (e.g. with a DAC/headphone amp) would bring their own laptop (and don't forget to bring a power board), because it's a pain to set up a DAC on someone else's machine and get everything sorted out.
People who brought just a few headphones tend to bring their own DAP, or politely ask to try their headphones on other people's source/amp setup. Most laptops and DAC/amps were set up on designated desks and there was not a lot of moving, shuffling around of heavy equipment. It was almost like vendor booths.
Some people brought CD's, but I'm not sure if anyone is bringing a decent CD transport this time.