Has anyone reached out to Fang at HiFiMan to supply some demo amps for the event?
With lots of people bringing HiFiMan cans (HE-400, HE-500, HE-6) it'd be great to hear them paired up. I'm sure lots of people would love to hear the flagship EF6 in action - I definitely would.
If I can make it, I'll bring my trusty ol' EF5.
Another interesting exploration would be any upgrade Hifiman cables that people (such as myself) bring. The same cables will fit all three cans you mention, so endless fun with combinations.
I have a highly modded EF5, which I wasn't going to bring because I'm focusing more on the K Works Bravissimo as the amp I'm showing, but I can bring the EF5 if some of you want to try it out at your own tables.