Has anyone had success adding an "Add to calendar" button to a page?

Hey, I recently had to do this for one of my pages - a confirmation page for a webinar registration. 
I didn’t use a long script like the link you shared.

I had three options - for Google, Outlook or iCalendar (Mac) as they use different formats.

For Outlook - you create an ical file that you then link to.
You can create one here: http://www.pratie.com/lab/icalendar/
You will then need to upload it somewhere so you can link to it. Then just create a link or icon on your page and link to it. 

For Google - you can create it all in a URL structure. Here is an example:
https://www.google.com/calendar/render?action=TEMPLATE&text=Your+Event+Name&dates=20140127T224000Z/20140320T221500Z&details=For+details,+link+here:+http://www.example.com&location=Waldorf+Astoria,+301+Park+Ave+,+New+York,+NY+10022&sf=true&output=xml

Just edit the parameters as you need. Sorry, it’s a bit fiddly, and too much for me to explain fully. More info is here: http://stackoverflow.com/questions/10488831/link-to-add-to-google-calendar

For iMac - which also needs an ical file (but different to Outlook) I had to use my wife’s Mac to create the event in iCalendar - then save it out as an iCal. I know that might not help much if you don’t have a mac - but that’s how I did it.

I then had all three clicks set as conversion goals.

Note that you will only be able to use this for a static known date. If for example you have a webinar registration with a choice of times/dates - that’s more complex. You could route them to different confirmation pages based on choice - or you could look at more complex passing of parameters.

I am sure there are other ways you can achieve this - but that’s how I did it.
Sorry but I cannot share my page to illustrate it as it’s under traffic right now and I don’t want to skew the results.

Hope this helps
thanks
Simon

PS - If you’re willing to pay to make this even simpler - you might want to check this out: http://addthisevent.com

Can you use the recurring events feature of AddThisEvent (Paid)?

Your events have to follow a pattern for this to work (Every Monday, 1st of the month…).