Duchess of Cambridge visits open farm

The transcript covers a celebratory event marking 30 years of the farm being open to visitors. The speaker expresses gratitude to attendees, highlights the farm's growth, and emphasizes the importance of community and education. The event is graced by the presence of the Duchess of Cambridge, who is welcomed and presented with gifts.

What is the overall sentiment expressed towards the attendees of the event?

How long has the farm been open to visitors?