www.devcity.net/net/article.aspx?alias=chordfinder
is one example. What i am suggesting is to use the
System.Drawing namespace and reproduce the calendars
as graphic images using the draw functions of the
graphics class. It is a bit painstaking but i think i
had seen one example in asp.net . You could also check
out some GDI+ examples (and sending e-mail  from .NET)
under chapters 26 and 27 in the 'ASP.NET Unleashed'
section of http://www.superexpert.com