The (v1) Service Desk Bulk Update Event can be triggered using Custom Logic. The following parameters are Required to execute the Event.

Service Desk Bulk Update

/**
* Event: Service Desk Bulk Update requested
* Listener Class: Servicedesk_Model_ServiceDesk
* Listener Method: eventBulkUpdate
*/  

PCR_Event::attachDb(
    "bulk-update",
    ["Servicedesk_Model_ServiceDesk" => "eventBulkUpdate"]
);
PCR_Event::trigger(
    "bulk-update", 
	[ 		
		"due_date_enabled" => "0",
		"sd_type_enabled" => "0",
		"sd_status_enabled" => "0",
		"csr_enabled" => "0",
		"contact_owner_enabled" => "0",
		"dept_hier_owner_enabled" => "0",
		"requestor_enabled" => "0",
		"sd_source_enabled" => "0",
		"assoc_proj_enabled" => "0",
		"impact_enabled" => "1",
		"impact" => "132",
		"urgency_enabled" => "1",
		"urgency" => "321",
		"RECID" => "25196",
		"dialogCallback" => true,
		"confirmed" => true,
		"comment" => "This is a comment",
		"users_recid" => "1217",
		"contact" => "216121",
		"cronEvent" => true,
		"selectedServiceDeskRecids" =>
		[
			"25196", //RecID of Service Desk record getting updated
			"25195" //RecID of Service Desk record getting updated
		],
		"selectedServiceDeskFilters" => [],

		"eventBroadcastBy" => "216121",
		"eventBroadcastTime" => "Oct 3, 2022, 3:19 pm",
		"eventBroadcastDayofWeek" => "1",
		"eventBroadcastHourMin" => "1519",  	
	]
);

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