Can we stop our supporters Facebook fundraiser from ending early?
Unfortunately you can't, but what you can do is ask your supporter to extend the end date so it finishes at a later date.
If you are using our custom one-click fundraiser then this can be set within the event set up itself, however if updated AFTER people have clicked the link this will not update retrospectively - if in this instance you needed the end date extended you would need to ask your supporters to do so.