Hi,
You could use conditional formatting with a rule based on formula (so CF - New rule - Use formula ...)
select A5:A369 and paste formula (weekends excluded only):
write down a list of public holidays (I tried to complete but in Australia you get some teritory regulations, so may be I got somewhere wrong, also I "moved" australia day to 16th, to show some difference also today) for instance in H2:H14 and refer to it in NETWORKDAYS function. So next conditional formatting (still all days selected) would be:
See attached file
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