I didn't complete this event task before it disappeared. (not that I would have been able to complete it anyways, I just want to know why it's gone from my event tasks list)
Also what other event tasks will disappear before the event is over? Will any of the event tasks asking you to open datapads disappear before the event is over? I currently have an "open titan datapads" task that is 1/3 and I can open 2 more right now, but I want to wait for operation D before opening them. I don't want this titan datapad event task disappears before I complete it.