One could argue that the firing decision should be communicated in a meeting intended to discuss either some incident that causes the firing or a previously sch

One could argue that the firing decision should be communicated in a meeting intended to discuss either some incident that causes the firing or a previously scheduled meeting on the progress (i.e. lack of it) a performance improvement plan or some equivalent. Firing should not be arbitrary, there's some reason for it that the person would/should know, so that reason (whatever it may be) is a reasonable topic to mention in the meeting invite.