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The ticket itself has a court date on it - don't ignore that deadline or you're looking at bigger problems. If you've renewed since then, definitely bring your new registration to court, but here's the thing: call the court clerk before your date and ask if they can dismiss it administratively once they see proof of renewal. A lot of people don't know you can do this without showing up in person, saves you a whole trip.
Most jurisdictions let you contest the ticket if you've since renewed your registration - bring proof to traffic court or handle it by mail depending on your local court's process. If you were driving with an actually expired tag, you'll likely need to pay the fine, but check if your state offers traffic school to avoid points on your record.
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