The OTEPTA calendar is now a Google Calendar. You can view it on this page, or, if you have your own Google Calendar already, you can add the PTA events to it.
To add PTA events to your own Google Calendar:
Open your calendar, Click on "Add" under "Other Calendars", choose "Add by URL", and enter:
http://www.google.com/calendar/feeds/calendar%40otepta.com/public/basic

Also, if you use iCal on a Mac, you can add the PTA calendar to iCal. Choose "Subscribe" in iCal and enter this address:
http://www.google.com/calendar/ical/calendar%40otepta.com/public/basic.ics
Once you've done this, PTA events will show up directly on your iCal calendar.

If you have questions, email me at bvk@pobox.com and I will try to help.