If you are a personal loan, repayment should not be a big problem because of the banking system. Generally, it is normal for the bank to be overdue for 3 days (if you apply for a loan next time, the handling bank can ask the current bank to issue a statement of the situation)
If you are a company loan, this is another matter. The maturity date of working capital loans is generally postponed to the first working day after the holiday (the interest from the maturity date to the settlement date shall be borne accordingly).