Hi Jdesign,
Thanks for your interest. I recommend that you and your client check out our cool demo site, WPShindig. You can see Events Calendar PRO and our other add-ons there.
You should also download and experiment with our free core plugin, The Events Calendar. Although it doesn’t have all the functionality of our PRO version, it is a good introduction to the calendar and will help you test the plugin for compatibility with your themes and other plugins.
If you have any questions about the plugins features, etc., please post here and I’ll get them answered for you.
Cheers,
Leah