It is not possible to do anything other than make certain dates appear in bold.
If you want to make certain dates appear in different colours, your only option is to create a new control that inherits from the MonthCalendar control and shadow it's Paint method. This is fairly involved and requires a pretty good knowledge of the GDI object model, so I'd suggest that unless you have this, it'd be easier to stick with making dates appear in bold. Either that, or do a search on google to see if anyone has come up with a MonthView calendar control that allows dates to have their backcolor/forecolor/font changed.
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