As opposed to just rocking up, hide in the corner and check your email (or play a few games) on your phone.
Preparing for a meeting means that rather than just 'hoping for the best' - you will be in the best position to use the opportunity to progress the work that you do, make a contribution and showcase your capability.
Understand the purpose of the meeting. Decide what role you will take. Know the outcomes you require.
Just some of the preparation that needs to be done before a meeting.
Any other suggestions?