All,
Our Salesforce org history is set to 24 months. I recently created some code to sum "Total Completed Events" and although I can still see completed Events older than 24 months on a Contact page, it doesn't include them to the sum. I read up on queryAll(), but I'm not sure how to use it in my current SOQL. Is there a way to grab older events since inception using queryAll() that also won't grab deleted events from the recycle bin? Here is my code if that helps:

Class

public class TotalCompletedEvents {
    //Grab list of contacts
    protected final Contact[] contactNewList;
    protected final Contact[] contactOldList;
        
    public TotalCompletedEvents(Contact[] contactOldList, Contact[] contactNewList) {
        this.contactNewList = contactNewList;
        this.contactOldList = contactOldList;
    }
    public void execute() {
        Map<Id, Contact> contactMap = new Map<Id, Contact>(contactNewList);
        AggregateResult[] ars = [select count(id),whoid from event where EndDateTime < :date.today() and whoid in :contactNewList group by whoid];
        Map<Id, Contact> contactMap1 = new Map<Id,Contact>(contactNewList);
        for (AggregateResult ar : ars) {
            //System.debug('Total Completed Events: ' + ar.get('expr0'));  //get count()
            //System.debug('Contact ID' + ar.get('whoid'));  //get id of contact
            Contact c = contactMap.get((id)ar.get('whoid'));
            c.total_completed_events__c = integer.valueof(ar.get('expr0'));
            contactMap1.remove((id)ar.get('whoid'));
        }
        for (Contact c : contactMap1.values()){
            c.total_completed_events__c = 0;
        }
        //update ContactNewList;
    }
}

Trigger

trigger TotalCompletedEvents on Contact (before update) {
    Contact[] contactOldList = trigger.IsDelete ? null : trigger.old;
    Contact[] contactNewList = trigger.IsDelete ? trigger.old : trigger.new;
    new TotalCompletedEvents(contactOldList, contactNewList).execute();
}