There's no way to escape the fact that with the way the world currently does business, there are going to be delivery requirements for most companies that involve shipping outside of the 9-5 hours that used to be the business standard. It is easier for couriers and shippers alike to ship during regular hours, but sometimes this is just not possible, which is why most courier services do have a way for you to place an afterhours order with them at any time of day, including on holidays. These businesses need to operate like this, because they know that in a city the size of Boston that there simply needs to be a Boston courier service which can make after hours and holiday deliveries in order to keep business within the city moving smoothly.
Realizing that after hours and holiday delivery services are a value added service which many clients appreciate is what drives many delivery companies to offer these services. Even smaller, independent couriers that you may not expect to offer such service often do as a way of trying to ensure that customers deal with them. This is why holiday delivery is so often used as a feature item in promotional campaigns by couriers.
If you do require an after hour delivery, then you should expect to pay more for it. Almost every courier out there is going to charge some kind of a surcharge or a fee for deliveries made outside their normal business hours, and even more for those required on a holiday. The reason for this is that they often don't have someone already working during these times, and only send someone out on a case by case basis. Because of this, the company is going to face added expense, (especially if they have to pay an employee to work on a holiday) and the way that they recoup that loss is by adding on that surcharge to any holiday deliveries that are requested.
If you ask before placing your order though, all courier companies are required to tell you exactly how much those surcharges will be before you confirm your order, so that you can make an informed decision as to whether or not it is worth the added cost to your company. Often it is worth that extra money to get those holiday deliveries made, as it will make your company look that much more reliable in the eyes of your customers.