Example of how you can create a custom shortcode to pull values from EE events.

tw_ee_custom_shortcode_example.php

<?php
/*
Plugin Name: Event Espresso 4 custom value shortcode
Description: Adds  a [EE_CUSTOM_VALUE_SHORTCODE] shortcode to pull various values from the event.
Author: Tony Warwick
Version: 1.0
Author URI: https://github.com/Pebblo
*/

add_shortcode('EVENT_ESPRESSO_EVENT_VENUE_SHORTCODE', 'tw_ee_event_venue_shortcode');
function tw_ee_event_venue_shortcode( $atts ){
    // Setup the attributes for this shortcode.
    $atts = shortcode_atts( 
        array(
            'event_id' => null,
        ),
        $atts,
        'EVENT_ESPRESSO_EVENT_VENUE_SHORTCODE'
    );
    
    // Use the EE event models to pull an event using the event_id value.
    $event = EEM_Event::instance()->get_one_by_ID($atts['event_id']);
    // Check we have an EE Event object.
    if( $event instanceof EE_Event ) {
        // Pull the venue object from the event.
        $evt_venue = $event->venues();
        $evt_venue = ! empty($evt_venue) ? array_shift($evt_venue) : null;
        // Check we have a valid venue before using it.
        if( $evt_venue instanceof EE_Venue ) {
            // Return the venue name.
            return $evt_venue->name();
        }
    }
    
    // If we have nothing to return, just return and emprty string.
    return '';
}

add_shortcode('EVENT_ESPRESSO_EVENT_DATETIME_SHORTCODE', 'tw_ee_event_datetime_shortcode');
function tw_ee_event_datetime_shortcode( $atts ){
    // Setup the attributes for this shortcode.
    $atts = shortcode_atts( 
        array(
            'event_id' => null,
        ),
        $atts,
        'EVENT_ESPRESSO_EVENT_DATETIME_SHORTCODE'
    );
    
    // Use the EE event models to pull an event using the event_id value.
    $event = EEM_Event::instance()->get_one_by_ID($atts['event_id']);
    // Check we have an EE Event object.
    if( $event instanceof EE_Event ) {
        // Pull the 'primary_datetime' from the event.
        $primary_datetime = $event->primary_datetime();
        // Make sure we actually have an EE_Datetime object.
        if( $primary_datetime instanceof EE_Datetime ) {
            // Now output the start date.
            return $primary_datetime->start_date();
        }
    }
    
    // If we have nothing to return, just return and emprty string.
    return '';
}