What they mean by "bank holiday" is the closing of banks in the case of civil unrest caused by a collapsing dollar or stock market. We would probably see Marshall Law. People wouldnt be able to use credit cards, debit cards, etc. If you dont have cash, silver, gold or something of value to get things (if there are things to get..stores sold out) You would be SOL
This should be taken seriously and you should prepare by storing food and supplies as it could last for several months.