[Hero]

It's pretty vague when but we'll get a warning

"We are still not quite sure when the event will end as this event is tied to other special things that will be happening! So you have plenty of time to reach these goals. (We will have the event shops open for a bit after the event and the ability to hit the post goal will continue until 2 days before we close the event shop. You will be warned before these times occur.)"

Taken from this thread