Select Subject, Id, Facilities__c from event WHERE Event.WhatId = case.id 

List<Event> nonBill = [Select Subject, Id, Facilities__c, Services__c, Appointment_Status__c, OwnerId, WhoId,ActivityDateTime, ActivityDate, WhatId,Facilities__r.Address_1__c,Facilities__r.City__c, Facilities__r.Name,Facilities__r.Country__c, Sup_Provider__c,Sup_Provider__r.Name, Owner.FirstName, Owner.MiddleName, Owner.LastName,EndDateTime, Facilities__r.State__c, Sup_Provider__r.Provider_Role__c FROM Event WHERE IsRecurrence = false AND Appointment_Status__c = 'Non-Billable'];
        
	List<Case> sessionRecords = [SELECT Id, CaseNumber, Type, RecordTypeId, Status, Reason, Origin, Subject, Priority, Description, CreatedDate, CreatedById, Comments, Duration__c, To_DOS__c, DC_Unit__c, First_Bill_Date__c, Last_Bill_Date__c, Appointment_End_Time__c, Balance__c, Billed_Amount__c, Appointment_Start_Time__c,Cal_Bal_Amt__c, Cal_Total_Patient_Bal__c,Practice_Insurance_Service__c, Client_Insurance__c, Sup_Provider__c, Claim_Number__c, Session_Summary__c, DOS__c, Labels__c,Enter_Bill_Amount__c, Total_Billed_Units__c, Total_Amounts__c, Session_Notes__c, Provider__c, Practice__c, Session_Note_Status__c, Unit__c, PA_NO_PA__c, Client_Name__c,Provider_Name__c, Location_Name__c, Insurance_Name__c, Authorization_Number__c, Self_Pay__c, Billable_Duration_in_Minutes__c, Non_Billable_Duration_in_Minutes__c,Non_Billable_Unit__c, Session_Completed_By__c FROM Case];