have a host and a template. create trigger on the host, have it generate at least one event.
modify the trigger and replace host with the template in the expression.
go to monitoring -> events, make sure all/all is selected for group and host. for each event we get :

Undefined index: 10086 [events.php:621]
Undefined index: [events.php:664]
Argument 1 passed to hostMenuData() must be an array, null given, called in /srv/www/htdocs/zabbix/events.php on line 665 and defined [include/hosts.inc.php:1314]