You can enable dark mode from the “Appearance” section in the settings, which you can access by clicking the settings icon in the upper right corner. Users will now be able to choose between a dark theme, light theme or device theme.
Google warns that some extensions may not work as expected after the update. The update will soon be available to all users, including personal accounts and Google Workspace.
Previously, third-party extensions were needed to enable dark mode in the web version of Google Calendar.
Source: Ferra

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