Navigate to Event > [Event name] > Manage event galleries.
Use the Quick view button to see inside the source gallery.
Then click the first thumbnail then hold down your shift key and click the last thumbnail to select all the thumbnails.
Then click the Manage selected media button > Copy/Move.
Then choose the destination gallery.
Moving can take some time. You may see the thumbnails appear in the old gallery until they are complete.

You can also move/copy images from inside the Manage media page for each gallery.
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