It looks like you already have a good website, were you planning on changing it? PHPNuke is a Content Management System and it not needed for Easy PHP Calendar.
I myself as well as others are already running PHPNuke and need to integrate the calendar into it. Since you already have a website and if you have no plans on changing it, I would not
recommend installing PHPNuke just to use Easy PHP Calendar, since it's a fine stand-alone product.
The site I am working on is new and is a PHPNuke site (www.gracelandbaptistchurch.org
). I stumbled upon Easy PHP Calendar since I was looking for a calendar program that would integrate well with PHPNuke. I have found the support here and community involvement to be supurb.
I hope I helped you out (without stepping on any toes