Make Modern Tribe Events Calendar sort Woo Tickets by their product order.

functions.php

// Use this guide to order your tickets (products) in WooCommerce: http://www.endocreative.com/customize-product-sorting-woocommerce/
// Basically, you'll just Woocommerce->Products, click sort, then drag items around to get the order right.

// Per https://theeventscalendar.com/knowledgebase/changing-the-order-of-tickets/
// Add this just after the "ob_start();" line in your_theme/tribe-events/wootickets/tickets.php 
// tribe_wootickets_sort($tickets);

// Add the rest of this to your functions.php

// Sort alphabetical
function tribe_wootickets_sort_alpha($p, $q) {
        if ($p->name < $q->name) return -1;
        if ($p->name > $q->name) return 1;
        return 0;
}

// If menu_order is specified, use it else sort alphabetical
function tribe_wootickets_sort(&$tickets) {
    $are_tickets_ordered = false;
    $real_tickets = array();
    foreach($tickets as $ticket) {
      $real = get_post($ticket->ID);
      $real_tickets[$ticket->ID] = $real;
      if ($real->menu_order != 0) $are_tickets_ordered = true;
    }
    if ($are_tickets_ordered) {
      $final = array();
      foreach ($tickets as $ticket) {
        $final[$real_tickets[$ticket->ID]->menu_order][] = $ticket;
      }
      foreach ($final as $slot) usort($slot, 'tribe_wootickets_sort_alpha');
      ksort($final);
      $tickets = array();
      array_walk_recursive($final, function ($current) use (&$tickets) {
        $tickets[] = $current;
      });
    } else {
      usort($tickets, 'tribe_wootickets_sort_alpha');
    }
}