Where you trying to make the "Save the Date" hyperlink go to a landing page instead of an ICS file? I don't think you can do that as part of the ICS file.
The "Save the Date" hyperlink automatically links to the ICS file. So, when you put the calendar token in your email (or on your landing page) the text will say "Save the Date". When a lead clicks that text, it will open a blank browser window and automatically download an ICS file. If you double click it, it will open up in your calendar.
You can change the text of the hyperlink. I changed mine to say "Add this event to your calendar (.ics)". but you can't control anything else about the hyperlink.
I hope that helps.