You can easily do it outside of DocuSign programmtically using the API. Set up a draft envelope and then set a reminder task to run the send envelope function X days later.

You can also set up an intersititial recipient who's job it is to simply sit on the envelope until they receive a reminder email X days later and which then prompts them to complete their portion of the envelope. This doesn't even have to be a signing recipient, they could simply specifiy recipients or some other action.

But unfortunately there's no current option within DocuSign itself to send on a date in the future.

Hope this helps.