public event EventHandler<DrawDayEventArgs> DrawDay

private void gcCalendar1_DrawDay(object sender, GrapeCity.Win.Calendar.DrawDayEventArgs e)
{
    // Get the DateTime for current day view.
    DateTime drawingDay = new DateTime(e.Year, e.Month, e.Day);

    // Define the default color of the brush as black.
    Brush myBrush = Brushes.Black;

    // Draw the background of current day view.
    e.DrawBackground();

    // Determine wehter the current day view is sunday.
    bool isSunday = drawingDay.DayOfWeek == System.DayOfWeek.Sunday;

    // Determine the color of the brush to draw different kinds of day view.
    if (e.IsTrailingDay)
    {
        myBrush = Brushes.Gray;
    }
    else if (isSunday)
    {
        myBrush = Brushes.Red;
    }

    // Define the format of text being drawn.
    StringFormat format = new StringFormat();
    format.Alignment = StringAlignment.Far;
    format.LineAlignment = StringAlignment.Center;

    // Draw the current day view text based on the current Font and the custom brush settings.
    e.Graphics.DrawString(e.Text, gcCalendar1.Font, myBrush, e.Bounds, format);

    // Draw the today image and focus rectangle for today day view and focused day view.
    if (drawingDay == DateTime.Today || drawingDay == gcCalendar1.FocusDate.BaseDate)
    {
        e.DrawTodayImageAndFocusRectangle();
    }
}