is there a way to put a date range thats not due dates

[Ashlee Evans]

example would be package expected to be delivered between date A and date B.

[Mike]

There's not a native option for that directly, but you could do that with two Custom Fields, one for the beginning of the range, and a second for the end. There's no way for this to show on the calendar, though, but you'll be able to see these two dates within the card.