[Closed] International Week - discussion topics

College has landed me with chairing a bunch of round table discussions during lunchtimes for International Week which is in May.

Whole thing is linked to Homecoming Scotland, but I'm having trouble thinking of suitable topics. It's supposed to encourage staff and students, native speakers and those learning English.

So far:

• Expansion of Edinburgh airport.
• Immigration into Scotland vs. England.
• The environmental impact of Homecoming 2009.
• The role of the US in international affairs.
• The role of Scotland in international affairs.

And should I be looking at a Question Time format, or something a bit less hostile?

It's late and I'm lacking inspiration. Help me out!