>fill the bath tub just in case??

Only if you are on well water and the power goes out, which I don't think it will.

>Just over 1/4 tank of heating oil in the tank

That'll last the weekend.

>Car battery on a trickle charger

I've never had an issue starting my car when it is that cold. So long as your battery isn't like 7 years old.

>Flashlights and chargers and batteries accounted for and ready

As far as I know we are just getting cold, not a "storm". Your power should stay on.

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Honestly anything down to -5F is kind of business as usual. If you are super paranoid about your pipes freezing, just turn your taps on a little bit before you go to bed to keep the water moving, but that is probably unnecessary this weekend. It is one day of slightly colder than normal for this time of year.