ZeroNights is coming up this December in Moscow. There are multiple firmware security-related presentations at this event,
Not only will Nikolaj Schlej will be speaking on UEFI, perhaps his first conference presentation?
But there are at least two other firmware-related presentations:
They also have a Hardware Hacking Village. Looks like a fun conference.
http://2015.zeronights.org/agenda.html
http://2015.zeronights.org/workshops.html