It could bedangerous allowing your cat outside on Independence Day.  Your cat could inadvertently get hurt by the fireworks.  It is best to bring your cat inside a couple of days before the holiday.  Try to keep them in the house for a couple of days after the Fourth, also.  The Fourth lasts for a few days and people may be still letting fireworks go off.  Since fireworks are unpredictable, they could go off anywhere: up in the air or in the street.  Your cat could be up in a tree or just crossing the street.  This could put them in danger.  For safety's sake, your cat will only be inside for just a short period of time.  Have plenty of things for your cat to do, like, having a cat climbing tree or a sisal to scratch and some toys.  Be attentative to them.  Some people have a kitty sill so your feline can keep an eye out for things going on inside as well as outside.  They are very curious.  Of course, have a litter box that you keep fresh and clean for you favorite feline.  Enjoy the Fourth safely with you cat!