Try your bracelet with the actual kurta before deciding how much should show. A loose sleeve, a fitted cuff and a rolled sleeve leave different space at the wrist. You may like a glimpse of color as you move, or prefer the sleeve's embroidery to be the only detail there.
Start with the kurta and trousers you plan to wear, then add the watch or bracelet. You don't need both. If the garment is borrowed or unfamiliar, ask how its sleeves are intended to sit before rolling or altering them.
Look at the sleeve in motion
Let your arm hang, bend your elbow and bring your hands together. Notice where the fabric settles and whether it passes freely over the bracelet. A long sleeve may cover the piece while your arm is down. Letting it appear occasionally is easier than holding the cuff back all evening.
If the sleeve has a close opening, inspect the clasp as well as the band. A narrow bracelet can still have a fastening that presses into the fabric. Remove the bracelet if the cuff catches; don't pull the garment across it to prove the combination works.
With a shorter sleeve, more of the wrist may be visible. Try the bracelet at its normal comfortable fit. Extra visibility isn't a reason to tighten it or buy something wider. The bracelet fit guide explains why one finger-gap rule won't suit every design.
Choose one detail to pick up
A maroon cord could add contrast to a cream kurta. A silver-colored chain could echo silver-colored embroidery, while a bracelet close to the garment's shade could blend in. You can mix metal colors too, if you like the result.
Look at the whole outfit; not every accessory has to repeat the same shade. A decorated neckline or embroidered sleeve may already give you the detail you wanted. With a watch, check whether the bracelet crowds the same wrist; use the other wrist or leave one piece off if it feels better.
If materials matter to your hosts, ask them directly; don't assume a cord or bead bracelet is automatically fine. And check what your own bracelet is made of, clasp and lining included, since a band can look like one material and be another.
A kara is a separate consideration
The Sikh Coalition identifies the kara as one of the five articles of faith associated with Sikh initiation. It's an article of faith, not a styling accessory. If you wear one, whether to add anything else is your call, based on your own practice and comfort.
Before joining the celebration
Follow your host's or the venue's guidance for the gathering. If candles or oil lamps are lit, keep sleeves and hands clear of them. London Fire Brigade's candle guidance includes diya lamps and keeping flames away from clothes. A snug bracelet won't make reaching across a flame safe.
Check your outer layers too if you will travel in a coat. You can put a bracelet on after arriving indoors, or leave it at home. For other outfit comparisons, the bracelet style guides offer ways to choose around clothes you already own.