So, we know what VFR Sectionals are for in the USA. One down, four to go.
Number two:
How is that system [of which cogwheel says we should have a basic understanding] supposed to work in Australia where there is no equivalent outside VNC coverage?
People who organise a fly-in at an unmarked strip under a busy IFR route and don't organise a NOTAM are demonstrating both a lack of understanding how the system works and a lack of airmanship.