I think we need this:
Every time an event starts, there are people here, on steam or reddit, asking questions about it’s release time, then there are people suprised that they didn’t get what they thought they will, because event ended and they didn’t know about it.
And countdown timers are simple and effective way to help people, even those who read patch notes, as a reminder. Can we get them? 
That would be too easy. You need to obscure information, so only the dedicated have the knowledge, just like incomplete patch notes.
Well, CW did have a countdown timer in it’s last days, and ReV also had one every week (dunno about Dickens), so SD either flips a coin when deciding to do it or not, or they only implement it during major events.
I agree it would be nice, was strange today playing my first game today then leaving to go check my inventory to not see an expert case.
That being said maybe we could have login rewards…either way IM going off topic. So YES to Event timers.