Related Clues:

• Emulate a valedictorian
• Speak at length
• Give a valedictory, e.g.
• Get on a soapbox
• Sermonize
• Sound off, perhaps
• Harangue the crowd
• Make a speech
• Deliver a declamation
• Deliver an impassioned presentation
• Use the soapbox
• Go on at length
• Discourse
• Get on one's soapbox
• Take to the pulpit