hide-events-tagged-with-x.php

<?php
/**
 * Remove events tagged with any of the slugs listed below from
 * event views.
 *
 * We deliberately avoid use of TEC functions and constants etc
 * so that this doesn't break should that plugin temporarily be
 * deactivated.
 */
add_filter( 'pre_get_posts', function( $query ) {
	if (
		$query->get( 'post_type' ) !== 'tribe_events'
		|| ! $query->is_archive()
	) {
		return;
	}

	// Add slugs of tags you wish to ignore here!
	$tags = [
		'ignore',
		'hidden',
		'missing',
		# add more slugs here
	];

	// Let's convert them to tag IDs
	foreach ( $tags as $index => $tag ) {
		$term = get_term_by( 'slug', $tag, 'post_tag' );

		if ( is_a( $term, 'WP_Term' ) ) {
			$tags[$index] = $term->term_id;
		}
		else {
			unset( $tags[$index] );
		}
	}

	// No tag IDs? No need to do anything :-)
	if ( empty( $tags ) ) {
		return;
	}

	// Grab any existing tag IDs we should ignore and combine with our additional IDs.
	$ignore_tags = (array) $query->get( 'tag__not_in' );
	$ignore_tags = array_unique( array_merge( $ignore_tags, $tags ) );

	// Update the query.
	$query->set( 'tag__not_in', $ignore_tags );
} );