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I have a custom post type 'Events' created by The Event Calendar plugin. It has registered it's own custom taxonomy. Is there a way I can assign the regular WP post categories to some of these events so that they will show up on category archives?

I see in the answer to this question get_posts cannot grab from specific category that I have to add 'category' to the array of taxonomies supported by the Events post type, something like this:

register_post_type( 'tribe_events', array( 'taxonomies' => array( 'category' ) ) );

What is the next step I have to take to get this to work?

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This question is hard to understand, regular post categories will already show up for category archives, what do you mean by assign. – Wyck Jun 26 '13 at 4:23
So you want to allow Events to share a taxonomy with regular posts? – Pat J Jun 26 '13 at 4:25
Exactly, I need the Events posts to share the regular posts taxonomy. – Chris Jun 28 '13 at 15:49

You can use register_taxonomy_for_object_type() to use a taxonomy with a post type, without having to touch the post type registration code, example:

function wpa_categories_for_events(){
    register_taxonomy_for_object_type( 'category', 'tribe_events' );
add_action( 'init', 'wpa_categories_for_events' );

To have events appear on the category pages, I believe you have to modify the default category queries via pre_get_posts to add custom post types, by default they only query the post post type.

function wpa_events_on_category_pages( $query ) {
    if ( $query->is_category() && $query->is_main_query() ) {
        $query->set( 'post_type', array( 'post', 'tribe_events' ) );
add_action( 'pre_get_posts', 'wpa_events_on_category_pages' );
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