Meeting requests are received when another member has invited you to an event. Meeting requests are visible in multiple locations in your account.

My Day - Universal Inbox

Meeting requests are visible in the Universal Inbox. Clicking on the bold text Meeting Requests will take you to the the details of the request. At this point you can choose to Accept, Decline, or mark the meeting as Tentative.

Scheduler

From inside the Calendar application, you can find the Scheduler window to the left (default) of your main Calendar window.  The Meeting Request view is found just above your above your yearly calendars. Clicking on the bold text Meeting Requests will take you to the the details of the request. At this point you can choose to Accept, Decline, or mark the meeting as Tentative.

Bolded Calendar Appointment

Meeting requests are also placed directly inside of  your calendar, in the corresponding time slot. They are distinguishable by bold text. By right clicking on the request , you can choose to view the Details of the request, Accept, Decline, or mark the meeting as Tentative.