wordpress - Get post type and category -

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on frontpage (index.php) display posts of type 'event' category 'main' of type 'post'. how can merge 2 conditions? in current code, can filter 2 post-types not category 'main'.

<?php global $wp_query; $args = array_merge( $wp_query->query, array( 'post_type' => array('post','event') )); query_posts( $args ); ?>

just change $args this:

<?php $args = array(     'post_type' => array('post','event'),      'tax_query' => array(           'relation' => 'or',        array(          'taxonomy' => 'category',          'terms' => 'main',          'field' => 'slug'        ),        array(          'taxonomy' => 'event_tag', // needs whatever custom taxonomy have declared custom post type.          'terms' => 'main',          'field' => 'slug'        ),     ) ); ?>

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