Display upcoming Events for next 7 Days

I haven’t had much success in the past using the BETWEEN comparison with meta queries. You might have better luck by replacing your meta query with a >= and <= comparison:

'meta_query'  => array(
   array(
    'key'     => 'opening_time',
    'value'   => $today,
    'compare' => '>=',
    'type'    => 'DATE'
  ),
  array(
    'key'     => 'opening_time',
    'value'   => $future,
    'compare' => '<=',
    'type'    => 'DATE'
  )
)

Depending on your application you may want to tune the results a bit by dropping the “or equal to” from one or both of the statements (right now it’s being very forgiving).

As for the PHP error, the code you provided doesn’t end the “for” loop with an endfor. Have you checked your PHP error log? You can also try turning on WP_DEBUG in your wp-config.php file.

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