Scheduling Tasks in Relation to Project End Date

Scheduling Tasks in Relation to Project End Date

I use Zoho project  to help manage tasks that relate to a number of specific business events that take place. 
I would like to be able to have my project end date be the date of the event and then work "back" from that date to say...
 
Add a task 2 weeks before the project end date to remind me to XYZ. 

Does anyone know if there is a way to base task timings back from a project due date rather than a project start date?