1 August can be a very difficult day for the mutts.
After spending one 1 August in the Tierspital when my extreme noise-phobic dog went into convulsions after each bang, we gave up and the next year spent the day in Germany or France. We continued to do that every year while he was alive - 1 August was simply was too dangerous for him.
If your dogs' fear is not that extreme, in addition to closing the binds or putting on soothing background music, you could also try body wraps or a t-shirt as a calming aid. I've had good results using TTouch to relax the mutts a bit. Some people use DAP dispensers or DAP spray on bandanas - I didn't really see any improvement when I tried it, but some say it makes a difference for their dogs.
Some trainers recommend desensitizing, using a fireworks (or other scarey noise) CD... This approach can be effective when done using positive reinforcement and change-the-association, but usually takes some time to accomplish. (Going too fast can result in flooding.)
We had a breakthrough last year, the first 1 August after my deaf oldie joined the family. He can't hear a thing so he naturally he does not even notice, let alone react, when the neighborhood explodes. My other dogs, who the year before had been terrified, remained calmer - they clearly took their cue from the little guy. (Do you know any non-reactive dogs who might want to come over that night for a play date? )
Ignoring the madness outside seems to be the best way forward; I try to keep calm, we try to have a quiet family evening as if it was any other day. The operative word being 'try'.
It is often best to put a dog on lead if you have to go out in the garden while the rockets are flying. Every year dogs get spooked, jump fences, and end up lost - and a few never make it home.
Other than that, I pray for rain.
FYI, an article from the Tagi, with tips for helping your four footed friends get through the day:
http://www.tagesanzeiger.ch/leben/ra...story/10294878
Wishing all the doggies out there a safe and sane 1 August.