I don't think you need to create a whole different rank for people interested in creating social events. The great thing about this guild is the liberal way in which is run, which is to say that pretty much every member has a voice. You don't need a special rank if you're going to set up anything, there have been so many examples of people starting things without an officer rank, Hyrath with Late Night Raiding, Leviethan with Old World Clearing, Contagion with his group for starting the Ashes run, etcetera etcetera.
This whole "PCG needs to start doing fun things" discussion is all very well, but people who actually care need to start taking the initative in my opinion. You don't need to start this big debate, and you certainly don't need an officer rank, just go and start one! I can think of a dozen things to get everyone involved that do not take that much effort, and I think we're turning this whole thing into a bigger thing than it needs to be. Lets stop discussing the matter and go and do something.