I would recommend contacting a company like Entech Solutions, as they make custom calendar applications, and they could assist you with your needs. Its one application is the XScheduluer, which you can see a demo below:

http://www.entechsolutions.com/Products/XScheduler/Demo.aspx

Here is an overview of some of its products:
http://www.entechsolutions.com/Products/Overview.aspx

Entech can also build custom applications that will fit your needs. Since they already have the product made, it might be good to look into a company like this that makes custom ones.

I know Niraj, the co-founder of Entech, and he probably would be happy to assist you with this product. Let me know how it goes.
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Have you considered php-calendar (http://sourceforge.net/projects/php-calendar/)?

It's open source so you can easily get at the code if you need to look at it. There are example sites using the calendar linked from the project wiki (http://www.php-calendar.com/wiki/index.php?title=Main_Page).

It runs on PHP 4.1 or later and MySQL 4 or later.

It certainly looks as though it may do what you want.
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Have you considered using the Google backend, and writing your code as an interface to that? You still get all the advantages you say - front end designed how you want, 'open' code, etc - but you can focus on the presentation and logic, and not have to worry about reinventing the core of a calendar engine.
Source(s):
http://code.google.com/apis/calendar/


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