It took me a few minutes to discover the (well) hidden menu option to send an email to all attendees of a calendar event.
It would be fantastic if there was an option - maybe even a button [under “Schedule” next to the first participant name] to “Add attendees to Contacts”.
When “clicked” a list with checkboxes next to each name, and an “All” checkbox to appear and allow the user to select meeting participant that will be added to the Contacts.