Rather than bumping this topic to the top and making an issue of it, simply report it as now being over. Also, sometimes the announcement of expired events may stay up for a while before finally being locked. Perhaps it's a means of letting new people that if they visit here often, they will be informed of limited time events and rewards.
I'm sorry to say, but your good intention is starting to make you look bad. Just report it or ignore it. Don't make an issue of it. Please.