Views integration template missing for civievents, and others produce errors

On drupal 7, with views 3, date and calendar modules enabled, a template for a civievent view is not showing at admin/structure/views/add-template. The views templates for civicrm_relationship, civicrm_membership, and civicrm_participant do appear in the list. However, enabling one of these templates produces log messages as follows:
Notice: Undefined index: civicrm_relationship in calendar_plugin_row->pre_render() (line 259 of /var/www/alga_civicrm/sites/all/modules/calendar/includes/calendar_plugin_row.inc).
Notice: Undefined index: controller class in entity_get_controller() (line 7617 of /var/www/alga_civicrm/includes/common.inc).
The issue is discussed in the forums at: http://forum.civicrm.org/index.php/topic,23643.msg99641.html#msg99641