Hi Bonnie,
We are in the discussion stage right now and we are actually surveying people regarding what would count. We have discussed things like pedagogically-related book circles, "lunch and learn" sessions, to the more formal instructional skills workshops, etc. Our main focus is in celebrating efforts related to enhancing one's teaching.
Personally, I certainly do not hold the assumptions that formal and informal learning are directly tied to contrived vs authentic, respectively. Both of these types of learning can be either primarily depending on the motivations of the individual. Added to this in the formal contexts, the motivations and assumptions of the facilitator(s) for holding the formal learning session.
My thoughts...