As a meeting planner, you must be able to appear interested in the discussion, even when you have no idea what's going on.
The 5-Second RuleWhen someone speaks, pretend to nod along for 5 seconds before responding. This will give the illusion that you're engaged.
Active Aggressive NoddingA more advanced technique where you nod vigorously while making eye contact. This will make others think you're deeply invested.
Parroting the Last SentenceRepeat the last sentence spoken by someone to show your agreement. This will make them think you're a great team player.