Petro,
Sorry, according to the press release from the NAC, this is false news.
Apparently, there's an email doing the rounds in POM/ PNG that the airport will close but it's a hoax.
N.B. I'd guess there may be some restrictions when some of the official aircraft arrive, namely Airforce 2(the Donald isn't attending, so no AF 1), which is pretty usual when these things happen but they're not going to close the place down for 11 days.