Make them optional attendees.

Signature
Milly Staples [MVP - Outlook]
Post all replies to the group to keep the discussion intact. All
unsolicited mail sent to my personal account will be deleted without
reading.
After furious head scratching, Debbie asked:
| How do I schedule a meeting request and include others in the request
| for their information only? They are not required to attend the
| meeting.