I think there could be one of two options:

In a due date board

1 - make a top so it's always sticky and at the top to keep track of updates. Can be modified by anyone? or whoever started it?

2 - Have the option on this board where you can "mark" a particular post in a thread, so it's always the most recent one showing all of the dates (so if there are 11 pages, it's always at the bottom of page 11)