Hi Cory - you need a master calendar that introduces a new date field that links to both types of your dates
Here is a good link:
This would have to be a central table that joins to both tables that have dates. You may need to setup a central link table that has all the common dimnesions (sku, date ) or it may make sense to just merge the two tables by SKU first. There are a few options on the modelling but it depends what you are trying to do .
Either way take a look at the blog and see if that helps