So what is the Northern Ireland Investment Conference all about?
Announced by David Cameron ahead of this summer's G8, it's designed to bring the bosses of multinational companies here to persuade them to set up bases in Northern Ireland.
120 chief executives or other "C" level bosses of companies from 14 different countries including Japan, Russia, US, Brazil and China.
Current inward investors, the likes of HBO, Citigroup and Allen & Overy, will also be there to give testimony on their experiences.
How long does it last?
In effect, 24 hours.
The first official engagement is a dinner at 7.30pm today.
On Friday the hard sell begins at 8.30 at a conference in Titanic Belfast as well as "sector workshops" in Queen's University, The MAC Theatre and Belfast Harbour Commissioners.
At 4pm, there's a networking reception at Stormont but it's all wrapped up by 6pm.
What could Northern Ireland get out of it?
Potentially thousands of jobs and millions of pounds of investment. It's thought the last conference in 2008, which focused just on US investors, was instrumental in getting Citigroup to set up shop here.
This conference is shorter and more intense, but open to investors from across the globe.