A bit late now maybe (although we have more displays here tomorrow, oh joy), but I do this for Remy:
> a bolthole - somewhere covered up and small and as dark as possible that he can take himself to if needed. He's not so keen on crates - bit big - so I just clear a little gap somewhere, give him a soft bed and hang a sleeping bag over the top. In between chairs works quite well.
> everything up loud - rock music works well cos it's constant and 'busy', TV wise I've had Nightmare Before Christmas playing over and over for the last few hours because it has a constant music score so there's no break in the sound that bangs can be heard through.
> valerian! made the world of difference a few years ago, I tried the scullcap & valerian tablets and they helped but I've since tried him on valerian tincture - I get mine from Holland & Barrett (considerably cheaper than Dorwest I find and of course they have their random sales), 1ml is about the same dose for his size as the tablets. This year went a bit wrong - Soli was on huge doses of it for her stress before she died so I ran out of it much quicker and my local H&B had sold out so he's been on valerian root. Nowhere near as potent/effective, he's had nearly 3 times the dose of those to help him tonight but it has helped still.
> a big bowl of pasta, about an hour after dinner - this helps to raise the serotonin levels and the dog feels full so it helps calm them down (just like us, feeling sleepy after a big meal).
> reassurance. The old adage is to completely ignore the dog - rubbish. Any animal or person in a state of fear needs something familiar and reassuring, and it helps. Not lots of 'good boy's and treats of course, just a good cuddle or gentle stroking helps to keep them calm.
There are other things, some have been mentioned already - a thundershirt (tight fitting t-shirt works well if the dog responds to pressure comfort), Bach rescue remedy, Serene-Ums, Calmex, Kalm Aid, diazepam for some dogs - it's all what suits. Some people have good improvement by putting cotton wool balls in the ears, although it didn't help Remy. Horses for courses!
Also once the fireworks are over, now is the time to begin a desensitisation/counterconditioning program ready for next year - the longer you give it the better.
Next year my plan is a one-step approach: going on holiday to the middle of nowhere!