What You Can Do
(In no particular order)

• I’m going to assume your plants are going to be okay – but your containers my not be completely freeze-proof. It’s the “high-fired” ceramic pots that can survive the frozen temps. (These are usually the big garden pots from Asia. The walls of the pot are usually 1” thick and don’t absorb a lot of moisture. We also recommend putting them up on pot feet, to allow any rainwater to drain through freely, so the water in the soil won’t freeze, expand and break the pot.)
   
• Oh, and anything terra cotta will not be okay - you may want to bring those closer or inside.
   
• Gather your pots together into one place if you can. A lone pot will freeze much fast than a grouping of them. This will help with:
   
• Cover your containers in plastic, old sheets or blankets, burlap or drop cloths at night. Don't make it too heavy that it'll bend the plants, or use something to hold it up, like the back of a patio chair, for example.
   
• Be sure to take the plastic/sheets off in the morning to the plants can breathe. Chances are it must might be clear and sunny and that sun will warm-up the plastic and create a greenhouse effect for the plants which you don't want. 
   
• Use boards, patio furniture, cardboard, fallen boughs from the last storm, or even a carpet to help shelter the area for the duration of the freeze. It won't look pretty but your plants will thank you.
   
• For your tenders, bring them inside, in a cool spot next to the door if you have to. If you can put them out during the day - ONLY if it has warmed up enough to do so! - and bring them back in at dusk, that would be ideal. Otherwise, they should be okay for a couple of days inside, in a cool spot. Protect your floors from the moisture from the pot - use a saucer, an old plate or old cookie sheet.
  
   

After the Freeze:

• IF your container has broken in the freeze, AND, knowing you probably have a TON of other things to do right now, just wrap a piece of plastic around the rootball for now. The idea is to keep the roots from drying out completely – so be generous in wrapping it. You can use burlap or cloth but you probably still want to put a layer of plastic over that, to keep the moisture in just in case you forget to water it.
   
• Don’t wrap the plants, just the root ball. Don’t wrap the bottom, you want any excess water run through otherwise the roots will rot in standing water. This will give you plenty of time to take care of your other priorities and to find another container. Remember to water it if it’s not getting any rain or melted snow.