I have an assignment group called "Ungraded," which is where I place reading assignments, surveys, etc. that do not have any points associated with them. I give it a weight of 0% toward the final grade, and assignments in that group are all marked with "Display Grade As: Not Graded."
The annoying thing is that this practice causes a black exclamation mark next to each student's grade, with the message: "Score does not include Ungraded because it has no points possible."
Feature request: if an assignment group has a weight of 0%, do not have it cause this warning message.
I suppose a couple work-arounds are:
* Get rid of the "Ungraded" group and dump all those assignments into some other group that does include graded assignments.
* Add a dummy assignment to the "Ungraded" group and give everyone 1/1 on it. That won't affect their actual grade, since that assignment group has a weight of 0%.
Unless someone has a better suggestion, I'll probably go with the first option, since it creates no noise on the students' side.