I would like to have an appointment calender and an event calender so my clients can see available dates and then book consultations.

I think I've found a calender that might fit the bill -
http://www.availabilitybookingcalend...lots/index.php

Requirements seem to be met by ZenCart:
Using a simple piece of JavaScript code you can put Event Booking Calendar on any web page. To use the calendar your hosting account needs to support PHP 4.0 or more and MySQL 4.0 or more.

Can I create a define page, called from links elsewhere on my site that would 'hold' this calender page? This define page doesn't necessarily need to be called from the sidebox links.

Does this sound doable?

Thanks