So I called an audible last night (as did several of my friends) and opted to take the night off from running.
This close to race day, the training gets interesting. On the one hand, if it's your first time ever training for the distance, this is the point at which you're increasing distances for the first time. It's also close to the point at which you start getting paranoid about things like injuries or illness - one little slip, or a week or more of illness, might scuttle things on race day.
On the other hand, it's at this point that the amount of work you can put into your training starts becoming more and more limited. In a couple of weeks, you will reach the point at which there is nothing more you can do to prepare for race day.
So this time in training is a delicate balance between training enough and avoiding over-training. Which means that even if I missed tonight's run, I'm confident that things will still be ok on race day. Stay safe and warm out there, fellow runners!