Pass through multiple date relationships into drillthrough

I have two tabs on a report displaying team statistics - the top-level summary page, as well as a per-person drillthrough for detailed metrics on that person.

I have two date relationships that are used in creating my summary measures, but have been unable to figure out how to pass both relationships down to the drillthrough/detail level.   I have tried using two date tables as well as USERELATIONSHIP, but to no avail.  

How do I do this and/or what's the best practice around presenting this sort of summary/detail information?

Thank you!