Does anyone think Bitcoin might gain greater adoption if more accountants and lawyers knew how to advise their clients?
Sponsor is possibly concerned over conference diversity. Solutions:
1) Address sponsors concerns
2) Seek alternate sponsor without the concerns
3) Seek non-sponsorship funding (bank loan, kickstarter)
4) Cancel conference, transfer blame onto those who stated event diversity.
This is not trolling. And I absolutely agree with their criticisms.
And there's a few tweets by @britruby that have been deleted.
In general http://lanyrd.com/ is the closest I've found, but it's still not comprehensive.