When you schedule a meeting, you give it a subject or title which is seen and shared by all recipients. So for instance if I create a meeting with a Person named Jack and use the subject, 'Meeting with Jack' - that is convenient for me, but not for Jack. If  I use the subject, 'Meeting with Ryan' then that is convenient for Jack but not for me. 

Adding a second subject/title field for meeting recipients would be a real useful feature for meeting invites. 

Subject A could be what I the meeting creator sees. 

Subject B could be what the invited recipients see.

For instance, the Subject A I see could be, 'Planning Call with Client X' and the Subject B that the recipients see could be, 'Planning Call with Ryan's Company for Team Turbo'

Hope this makes sense.