Location: includes/mcp/mcp_forum.php, function mcp_forum_view
Parameters: action, forum_info, start, topic_id_list, post_id_list, source_topic_ids, to_topic_id
This event is necessary for QTE port (https://www.phpbb.com/customise/db/mod/qte/)
That can be used to get some data in order to execute other actions.
I think it could placed at line 79, juste before that one :
$pagination = $phpbb_container->get('pagination');