This February I'll be visiting London, consulting on RavenDB and giving our course at Skills Matter. There is also a free session, in which I'll discuss the RavenDB indexing system and how to make the most out of it.
More info on our RavenDB London course (Feb 28-29): http://skillsmatter.com/course/open-source-dot-net/ayende-rahiens-ravendb-workshop
The "In The Brain" session (Feb 28th, 18:30): http://skillsmatter.com/event/open-source-dot-net/ravendb
I might have a free evening there, and I'll be happy to discuss RavenDB or any other dev topic over a beer. Just saying.