Saturday November 3rd, 2018 from 00:00 to 23:59 UTC. The RaDAR “Challenge” is a unique event aimed at promoting the use of Rapidly Deployable Amateur Radio stations. Categories (Fixed / Field / Moving) may be changed at any time during the challenge. The points system is so structured as to encourage portable RaDAR operations especially moveable RaDAR stations.
RaDAR operators are encouraged to be self-sufficient during each challenge, with not only power supply and communications equipment but food, water, protective clothing and shelter.
See the above link for details on the November 3rd, 2018 challenge and:
for background information.