Change Travelify home page to include Event Espresso events that have the "home page" taxonomy (espresso_event_categories) term.

functions.php

<?php
//* Please do NOT include the opening php tag, except of course if you're starting with a blank file

add_action( 'pre_get_posts', 'my_travelify_alter_home', 10 );
function my_travelify_alter_home( $query ){
    // add Event Espresso events to home page
    if( $query->is_main_query() && $query->is_home() ) {
        if ( isset( $query->query_vars['post_type'] ) && $post_types = (array) $query->query_vars['post_type'] ) {
            if ( ! in_array( 'post', $post_types ) ) {
                return;
            }
        } else {
            $post_types = array( 'post' );
        }
        if ( ! in_array( 'espresso_events', $post_types )) {
            $post_types[] = 'espresso_events';
            $query->set( 'post_type', $post_types );
        }
        // set taxonomy and category for home page
        $tax_args = array(
            'relation' => 'OR',
            array(
                'taxonomy' => 'category',
                'field'    => 'slug',
                'terms'    => array( 'home-page' ),
            ),
            array(
                'taxonomy' => 'espresso_event_categories',
                'field'    => 'slug',
                'terms'    => array( 'home-page' ),
            ),
        );
        $query->set( 'tax_query', $tax_args );
    }
}