Availability Overview
All available
All available if maybes confirm
Most available
None / conflict
Everyone you invite gets one link, says when they're free in plain English, and whenall finds the date that works. They never need an account.
A name on its own is fine. An email lets you send them the invitation from here — and you can always just share the link instead which will appear once you've created the event.
Your events collect in one place, and you can email the people you've invited. They never need an account — only you.