We use a service called Geocentric for our website, and that's where we keep our event calendar. We send out a weekly email with our events, and some of our subscribers have requested an "Add to iCal/ Google Calendar" option.
I've only been able to find solutions for this if people are managing their calendar with Constant Contact. Is there a way to create an "Add to [whatever calendar" option without importing the event to Constant Contact? It would be way too confusing and redundant to use CC to manage our events.