When I read your first post, I thought the same thing TigerC10 thought - that you just wanted to put birthdays on the calendar. Sometimes it helps to be a bit more verbose to let us know that you have already tried certain things.
But anyway, you will want to look at the file functions_calendar.php - the function construct_calendar_output I think specifically. You should look in the API (in Quick Links) and also read the code regarding it. I have a feeling you will need to modify the code directly instead of using any plugin.
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