Your naturalization oath ceremony has a date. You become a U.S. citizen when you take the Oath of Allegiance at the ceremony.
Watch for the ceremony notice (Form N-445) with the date, time and place. Bring it and your green card; you receive your Certificate of Naturalization at the ceremony.
Informational only, not legal advice. Go by the notice USCIS sent you, and confirm deadlines and options with USCIS or an immigration attorney.
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When you take the Oath of Allegiance at the ceremony, not when the N-400 is approved.
The ceremony notice (Form N-445), your green card, which you turn in, and any other documents the notice lists.
Usually, by following the instructions on the notice, but it delays your citizenship. Attend on the scheduled date if you can.