I know the support staff is short handed so I'll help where I can.
Are you trying to discontinue the use of Jevents for DT Register?
Otherwise, DT Register has a really nice sync feature. All of your events can be controlled by JEvents. You would add, remove, manage all event within Jevent MVC.
You then enable the plugin JEvent Sync.
To create a registration from your JEvents Calendar, simply Select JEvents Sync from the Event Type when creating a new event.
This will populate a drop down of all of the events in JEvents. Select the one you want, and create a registration for it.