Adjust posts_per_page value for Tribe Events Taxonomy requests

gistfile1.php

/**
 * Sets the number of posts to display on Events taxonomy pages to the value of
 * EVENT_CATEGORY_POST_LIMIT (if not defined, this will be defined as 10 by
 * default).
 *
 * @param WP_Query $query
 */
function changeEventCategoryPostsPerPage($query) {
	defined('EVENT_CATEGORY_POST_LIMIT') or define('EVENT_CATEGORY_POST_LIMIT', 10);

	if ($query->queried_object->taxonomy === TribeEvents::TAXONOMY)
		$query->query_vars['posts_per_page'] = EVENT_CATEGORY_POST_LIMIT;
}


/**
 * We are running the filter relatively late to try and counter the theme's
 * own filters. You can set the number of posts that you wish to appear on
 * event category pages by adding the following line before or after the
 * add_filter() call:
 *
 *  define('EVENT_CATEGORY_POST_LIMIT', 20);
 *
 * Where you wish upto 20 posts to display (as an example).
 */
add_filter('pre_get_posts', 'changeEventCategoryPostsPerPage', 80);