Does New Outlook have the functionality to NOT require responses on new event invites?

New Outlook supports this function; in the event form, turn off Request responses from Response options beside the attendee field rather than looking for it on the ribbon.^1^

Disable responses

1. Go to Calendar and select New event.
2. Add the 75 invitees under Invite required attendees.
3. At the right end of that attendee field, select the Response options icon/drop-down—the people/settings icon visible in the screenshot.
4. Turn off Request responses.
5. Complete and send the event.

The command does not need to be restored to the ribbon; its New Outlook location is next to the attendee field.

With Request responses disabled:

• Attendees receive the save-the-date invitation.
• You do not receive acceptance, tentative, or decline emails.
• Their responses are not recorded in the meeting invitation, so do not use this setting if an attendance count is required.^1^

If the control is not displayed initially, add at least one attendee first; Microsoft’s documented sequence exposes Response options after attendees are added.

References

1. Scheduling meetings with hundreds of attendees | Microsoft Support