Meta query date column add [x] days to validate

On top of my head this should be something like:

'meta_query' => [
        'key'     => '_EventEndDate',
        'value'   => [ $start, $end ],
        'compare' => 'BETWEEN',
        'type'    => 'DATETIME'
    ]

You would need to calculate boundaries yourself before passing to the query in this case.

See Custom Field Parameters in Codex for full documentation on parameters available for meta queries.

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