Awesome.  Works Great.  Thanks

Are you using a custom draw filter to achieve this display change?  If you are not then i highly suggest using one rather then changing the owners name... leave the crew name "as is" such as "CREW1"

and using a custom draw filter... change the header display to: "CREW1" & CrewNames

Implementing a DrawFilter is DEFINATELY a better solution (in my not so humble opinion).... to do so....

Create THIS custom Class.

Public Class OwnerDrawFilter
    Implements IUIElementDrawFilter

    Public Function GetPhasesToFilter(ByRef drawParams As Infragistics.Win.UIElementDrawParams) As DrawPhase Implements IUIElementDrawFilter.GetPhasesToFilter
        Dim OwnerHeaderElement As OwnerHeaderUIElement = TryCast(drawParams.Element, OwnerHeaderUIElement)

        If OwnerHeaderElement IsNot Nothing Then
            Return DrawPhase.BeforeDrawElement
        Else
            Return DrawPhase.None
        End If
    End Function

    Public Function DrawElement(ByVal drawPhase As Infragistics.Win.DrawPhase, ByRef drawParams As Infragistics.Win.UIElementDrawParams) As Boolean Implements IUIElementDrawFilter.DrawElement

        Dim OwnerHeaderElement As DayView.OwnerHeaderUIElement= TryCast(drawParams.Element.GetDescendant(GetType(DayView.OwnerHeaderUIElement)), DayView.OwnerHeaderUIElement)
        If OwnerHeaderElement IsNot Nothing Then
            Dim textelement As TextUIElement = TryCast(OwnerHeaderElement.GetDescendant(GetType(TextUIElement)), TextUIElement)
            ' Get the Owner associated with the element that is being drawn
            Dim own As Owner = TryCast(OwnerHeaderElement.GetContext(GetType(Owner)), Owner)
            Try
                If textelement IsNot Nothing Then textelement.Text = own.Name & " (" & FUNCTIONTOGETYOURCREWMEMBERNAMESANDCOUNT.ToString & ")"
                textelement.Rect = textelement.Parent.RectInsideBorders
                Exit Function
            Catch ex As Exception
                Exit Function
            End Try
        End If

    End Function
 

TAKE NOTE:
in the above class there is a function you will have to write... FUNCTIONTOGETYOURCREWMEMBERNAMESANDCOUNT
I suggest storing this string in your OWNERS.TAG (If it is not already being used for something else)

EG: when your crew gets edited... instead of changing the Name of your owner.... do the following:

Owner.Tag = "This is my new members names... There are 10 of us in the crew blah blah" (A shorter one is advisable )

Then Simply instead of writing a function as suggested above... just do the following in the above class:
If textelement IsNot Nothing Then textelement.Text = own.Name & " (" & Owner.Tag.ToString & ")"

 
ON YOUR FORM WHICH HAS THE DAYVIEW CONTROL... 

Instantiate a  new object of your new class and declare it publicly to your form.

Public CustomDrawFilter As New OwnerDrawFilter()
 
In the form_load event do the following:

Me.UltraDayView1.DrawFilter = CustomDrawFilter
 

I hope this helps and proves to be a more elegent solution for you. Let me know :)

Cheers
Aaron