Tribe: Change Community Events Success Message

functions.php

// Add to functions.php
add_filter( 'tribe_community_events_form_errors', 'ce_custom_success_message' );
function ce_custom_success_message( $messages ) {
    if ( $messages[0]['type'] != 'update' ) return $messages;

    $existing_messages = '';
    $type = 'update';

    if ( is_array( $messages ) ) {
        $existing_messages = $messages[0]['message'];
        $type = $messages[0]['type'];
    }

    // Set overall message by appending to the front
    $messages[0] = array(
        'type' => $type,
        'message' => '<h5>Thanks a bunch!</h5>' . $existing_messages
    );

    // Search/replace text for custom message
    $messages[0]['message'] = str_replace( 'Event submitted.', 'You successfully submitted an event. We will contact you soon!', $messages[0]['message'] );

    return $messages;
}