Thank you for writing.
You can use the ElementRender event of the inner calendar to modify the appearance of the cells in the calendar:
sender, RenderElementEventArgs e)
(e.Day.Date.Month == 5 && (e.Day.Date.Day == 1 || e.Day.Date.Day == 3 || e.Day.Date.Day == 6))
e.Element.ForeColor = Color.Red;
//e.Element.Enabled = false;
I hope this helps.
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