TimeTree allows you to invite other people to your calendar via invitation links.
１：【Invitor】Sending calendar invitation links
After creating a calendar, you may send invitation links via electronic mail, Twitter, Facebook, LINE, and more!
After selecting the URL of the invitation link, you are now a member of the shared calendar!
You can see the current members of the shared calendar.
All events, comments, photos uploaded onto the calendar can be viewed by anyone from the shared calendar.