Holiday Flat rate Shipping
Rules available in Advanced Flat Rate Shipping Method could let you create WooCommerce holiday shipping rates, as you could offer expedited shipping for your country around holiday seasons, encouraging customers to purchase on a deadline to get an order on-time.
Next, you probably can’t offer this guaranteed rate to all customers. Ensure you limited by certain shipping zones, or by location. You can limit by country, state/province, or even certain postcodes. This way, you don’t offer a guaranteed rate to a customer if they’re not in an area you can get guaranteed delivery for.
Now this rate will only be available before the holiday, and within your defined locations, helping you create a sense of urgency to drive purchases around holidays.