If this is not an existing feature now and it has to be a request, let me expand.
I would request that Raids be able to be marked as "non-attendance" in addition to Events having that flag.
Reason: We use Events to organize our Raids. Sometimes we will host an "unofficial" Raid for an Event that also contains other "official" Raids.
We do not want those "unofficial" Raids to count against Attendance. Creating duplicate Events (one that counts and one that does not) to store them would become cumbersome.
Thanks for your time.