I was trying to use the api to bulk move a bunch of calendar events that a new faculty had put in their agenda and not the course. Sidenote this seems to be a common issue. Anyways the events did not show up looking at the events using their user_* context. So I dug through the html and it looked like the events where part of a group_user_* context but using that return an error.
So the question is what context to use for agenda items?