William and Kate drinking Guinness

The video tutorial includes a series of formal acknowledgments and expressions of gratitude. It begins with an introduction and thanks for a generous gift, followed by honoring the presence of attendees. A toast is made to the Royal Highness, the Duke and Duchess of Cambridge, and the session concludes with closing remarks and thanks.

What is the significance of Shamrock in the speech?

What does the speaker ask the gentlemen to do?