Putting a publicly accessible calendar on website?

I think you might want to consider looking into Google Calendar service. It is free. You can create a Google Account (like a gmail account for example) and then within your Google Account you can create multiple calendars within that account. From there it becomes VERY versatile and easy - you cna create public calendars, private calendars, and you can even set private events on your public calendar and then give access to only specific people for specific events.

The icing on the cake? Google gives you simple copy and paste HTML code to paste your calendars right into web pages, and set all your preferences (for example - default view weekly or monthly) and you can invite specific people to specific private events on the calendar so that only those people can view those specific events.

It is truly the easiest way to have dynamic interactive calendars on your web sites without worrying about installing any special scripts or doing any programming.