The following code sets all Fridays to bold. To try the example, place a MonthView control on a form, and paste the code into the Declarations section. Then run the project.
Private Sub MonthView1_GetDayBold(ByVal StartDate As Date, ByVal Count As Integer, State() As Boolean)
' Presuming the start of the week is Sunday, set the variable intBold
' to the fifth Friday). Then set the State of
' every Friday to True.
Dim intBold As Integer
intBold = mvwFriday
While intBold < Count
State(intBold - 1) = True
intBold = intBold + 7
Wend
End Sub