'Add to Calendar' Link Generator
"I have a calendar event that I want other people to add to their calendar but I want to prefill the date, time, location, description etc. I know it can be done because sometimes I click the 'Add to Calendar' button on other websites but I don't know how."
1) Install this add-on (link to follow)
2) Go to the event in your calendar that you want other people to have.
3) Click the addon icon in the sidebar to the right of your screen. (If it is not there, look for a small arrow in the bottom corner to expand the addon section)
4) Provide your permissions for the addon to see the event details
5) Copy the generated link and send to whoever needs it. (Note, when users click your link, all the information should be pre-filled but they will still need to click 'Save'.