Possible Clues:

• Attention-grabbing behaviour
• Overly-dramatic attention-seeking behaviour
• Emotional display
• Overly dramatic behaviour
• Melodramatic behaviour
• Chap's right one to interrupt keynote speech at the start — it's play-acting
• It's Cornish shilly-shallying, imprisoning one exhibiting over-the-top behaviour
• Insist choir deployed staginess
• Exaggerated behaviour to attract attention
• King abandons his ploys, taking in no one over play-acting