Every event has one short link for the people you would rather post to than invite by name. Share, on the event page, copies it.
Pasted into a message, the link opens as a card with your photo, the title, the day and the place.
The same sheet has a QR code that opens the invite, and a poster to download and print.
Allow public replies, on the same sheet, lets anyone with the link answer, not only the people you invited. Leave it off and the link shows the invite without taking answers from strangers.
The shared link never addresses anyone by name, so it is safe to post anywhere.