Separate Display for Start date and End date using Date module
There a few options. If you're comfortable with code you could add a preprocess hook to duplicate the date field and manipulate its configurations. That is a little heavy-handed and hard to maintain.

With the Panels suite of modules (particularly panelizer module) you get the ability to do things like take over entity view modes. Then you can place fields as "panes" as many times as you want with different configurations.