Expo 2020 will be announced 27 November, in Paris..
"Dubai is competing against three other candidate cities in its bid to host the World Expo in 2020. The host nation will be announced on 27 November 2013 following a vote by the 167 member nations of the BIE."
Dubai welcomes World Expo 2020 delegates | GulfNews.com
The airshow begins on 17 November.