Thank you for writing.
You could customize also the EditAppointmentDialog and override its ShowRecurrenceDialog method. In this method you can take the date from the your custom EditRecurrenceDialog.
//do your changes here
//cast recurrenceDlg to your custom type and take its fields
IEditRecurrenceDialog CreateRecurrenceDialog(IEvent recurringAppointment)
I hope that this will help you. For other questions, feel free to write back.
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