Air temp is not so vital as soil temps. A freezing wind won't do much, but if the temps are likely to cause soil in your pots to freeze, then you need to somehow insulate the pots (and thus the roots).
We've had a few dips into low thirties here, and I did nothing at all to my Sarrs and VFTs. They are just peachy, not even really showing dormancy signs yet. Daytime temps are still disturbingly high here for Nov. I'm in SW Indiana, BTW.
I would bring in the D adelae, I had half of mine outside and half in as an experiment, and the outside ones haven't liked the weather at all. The inside ones were happy, so I brought in the rest a few days ago.
I know nothing about bromeliads, sorry.