I got my copy of that email at about 7:30pm Friday night.
It says there is to be a briefing in Canberra at 5:30pm Monday and one in Bankstown at 6:30pm Tuesday.
I liked the bit about ATCOs in the exhortation
PILOTS, AIRSPACE USERS AND AIR TRAFFIC CONTROLLERS ARE ENCOURAGED TO ATTEND
The quoted link
http://www.defence.gov.au/POTUS didn't work for me on monday morning.