It's almost as if someone at Oxford thought "what is the best possible birthday present we could get for Lee? I know! Let's broadcast a debate about randomized controlled trials and structural models on the internet! Yeah! On his birthday!"* Or something. 

All 4 plenary sessions from 20th-22nd will be going up live here featuring lots of very smart development folks including Paul Collier, Gabriel Demombynes, Michael Kremer, and David McKenzie.