Famed for his outspoken opposition to religious faith, he will take part in two question-and-answer sessions on October 21, alongside physicist Lawrence Krauss.
Tickets for the first of the two shows sold out yesterday morning.
The Strand Arts Centre in east Belfast said the tickets ran out within around 12 minutes of the box office opening, and without any effort to publicise the event.
Organisers have now laid on a second session, and tickets for this will go on sale at 10.30am today.
The question-and-answer sessions will follow screenings of a film called ‘The Unbelievers’.
It is described as following professors Dawkins and Krauss across the world whilst they deliver public speeches about the importance of science and reason, “encouraging others to cast off antiquated religious and politically motivated approaches toward important current issues”.
Professor Dawkins – whose stridency led one Telegraph columnist to liken him to Rev Ian Paisley – has gained worldwide fame with his books including The Blind Watchmaker, The God Delusion, and The Magic of Reality, and through his many broadcast appearances.
The film also features interviews with professor Stephen Hawking, as well as a raft of actors, comedy figures, and more.
For more details, see: www.strandartscentre.com