try using this (adjusted for the name of the control and the location of the range of dates) in the userform's code module:
Private Sub MonthView1_GetDayBold(ByVal StartDate As Date, ByVal Count As Integer, State() As Boolean)
For Each cll In Range("B2:B8")
If cll.Value >= StartDate And cll.Value <= StartDate + Count Then
State(cll.Value - StartDate) = True
End If
Next cll
End Sub
in code tags too (can't highlight bits with colour within code tags):
Private Sub MonthView1_GetDayBold(ByVal StartDate As Date, ByVal Count As Integer, State() As Boolean)
For Each cll In Range("B2:B8")
If cll.Value >= StartDate And cll.Value <= StartDate + Count Then
State(cll.Value - StartDate) = True
End If
Next cll
End Sub