Are you trying to suggest I’m that illiterate, dumb or attention-deficient, or are you trying to promote some guru wannabe ‘OldGuardian’ with their guide(s)? 
By the way, the event is still ongoing… or it should be, as far as I’m aware, you probably mean completing the task in question, don’t you?
Oh, and one last small thing: it did count completing the task on normal. In my experience with the previous events and even the first task of this event, you could generally do either a normal or a heroic bounty, unless specified, if you wanted to, however, for this one, apparently, the heroic version is not properly accounted for, which seems like an inconsistency and a bug. So, as of this writing, my suggestion (and the workaround to complete the task) would be: do not go to Onyxia’s bounty on Heroic due to the issue described above, do it on normal difficulty instead.