A budgie's danger is the crash, not just the fright
A budgerigar weighs very little and flies very fast, and its wild inheritance is to explode off the perch as one movement the instant something startles it. Inside a cage, that instinct becomes a night fright: the bird ricochets between bars and perches in total panic, and the injuries that follow, such as broken blood feathers, torn toes and concussion, are the real fireworks risk for this species. Everything in the plan below is aimed at that single moment, making the cage a place where a startled budgie flutters briefly and settles rather than crashing repeatedly.
Choosing and preparing the room
Move the cage before dusk into the room furthest from the street and from any window facing displays, ideally an internal room with no outside wall full of glass. Moving early matters because carrying a cage through the house after the bangs begin adds swaying, shadows and handling to an already rising stress level. Set the cage on a stable surface at about waist height, not on the floor where vibrations carry and not up high where a hanging cage can sway.
Draw curtains or hang a blanket over the window to kill the flashes, and plug in a low night-light. Complete darkness is a budgie hazard on a noisy night: a bird that startles blind cannot find a perch and keeps flying until it hits something. Dim, steady light lets it see the perch, land, and orient itself while still reading the room as night-time.
Making the cage itself safer for one night
Cover the top and two or three sides of the cage with its usual light cover, leaving the front partly open for air and for the bird to see the room's dim shape. Take out swinging toys, ladders that hang loose and anything with loops or dangling strands; a panicking budgie can tangle in seconds, and a swing turns a short flutter into a pendulum collision. Leave one familiar solid perch at the usual sleeping height and make sure food and water pots are seated firmly so they cannot tip onto the bird.
Sound, company and what to avoid
Play a radio or gentle television sound continuously from before the first fireworks, at a level that softens the contrast between silence and a bang without competing with it. Check in visually every so often rather than opening the cage or tapping the bars, and keep voices in the room low. Do not bring the budgie out for a reassuring flight, do not move the cage again mid-evening, and keep cats and dogs out of the room entirely, because a predator shape looming during a bang fuses the two fears together.
If a night fright does happen, switch the room light on low, speak quietly and let the bird find a perch on its own. Reaching in to grab a thrashing budgie risks your fingers doing the injury the bars did not.
The morning inspection, feather by feather
Budgie injuries hide well, so look properly in daylight. A broken blood feather shows as a stub with blood at its base or blood spattered on the cage floor; blood loss that would be trivial for a larger bird is serious at budgie size, and an avian vet should advise the same day. Also check for a bird that cannot grip with one foot, holds a wing slightly drooped, or sits fluffed and silent while cage mates move and feed. A budgie that is eating, preening and chattering by mid-morning has come through fine.
Small birds are easy to miss outdoors, which makes extra eyes valuable, and KinsLe's Circle of Love links free accounts into a wider local network of pet lovers who can help look out for your budgerigar if a fright ever does end with an open door.