If King Charles were to pass away before Queen Camilla, the queen consort would still retain her position within the monarchy, but there would be a small tweak to her title, which would become Queen Dowager Camilla. Queen dowager is the official name that is given to widows of late kings (via Cosmopolitan). Queen Camilla wouldn't be able to receive the role of sovereign, as anyone who is not related to the royal family by blood isn't named in the royal line of succession and therefore cannot inherit the role.
According to Men's Health, there is a contingency plan known as Operation Menai Bridge, which was prepared shortly after Queen Elizabeth II's passing, in the event of King Charles' death. While the details of the plan are kept secret, it is believed that the plan will be similar to Operation London Bridge, the funeral plan that was prepared for Queen Elizabeth. The funeral arrangements would begin immediately, and once the news of the death is announced to the government, commonwealth leaders, and the public, there would be a period of national mourning, followed by the official funeral ceremony at King George VI Memorial Chapel in Windsor Castle.
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