Example of how to force the EE calender for re-render when the window has loaded.

tw_ee_cal_rerender.php

<?php //Please do not include the opening PHP tag if you alreayd have one.

function tw_ee_cal_rerender(){
    wp_add_inline_script(
        'espresso_calendar',
        "jQuery(window).on('load', function() {
            jQuery('#espresso_calendar').fullCalendar( 'render' );  
        });"
    );
}
add_action( 'wp_enqueue_scripts', 'tw_ee_cal_rerender', 20);

tw_ee_cal_rerender_on_click.php

<?php //Please do not include the opening PHP tag if you alreayd have one.

function tw_ee_cal_rerender_on_click(){
    wp_add_inline_script(
        'espresso_calendar',
        'jQuery( document ).ready(function() {
            jQuery("#elementor-tab-title-5702").on("click", function() {
                jQuery("#espresso_calendar").fullCalendar( "render" );  
            });
         });'
    );
}
add_action( 'wp_enqueue_scripts', 'tw_ee_cal_rerender_on_click', 20);