Like the previous poster said - it really depends on how much you want to do/be involved. I am in contact with the WC a couple times a week going back and forth on everything from menus, flowers etc. We are also going for a site visit in September to arrange everything so trying to finalize the stuff for that as well.
What about DIY projects? I am working on my OOT bags now and also my ceremony programs, fans, etc. But if you aren't into DIY then I wouldn't worry too much!