I wrote the following code in which I will get mail with all Event in Tabular form, but after Execution I am not getting any Mail.

Kindly Help

My Apex Batch Class

global class EventBatchClass implements Database.Batchable<sObject>
{
    global Database.QueryLocator start (Database.BatchableContext bc)
    {
        String query='SELECT Owner.Name, Owner.Email, Subject, StartDateTime, EndDateTime, What.Name FROM Event';
        return Database.getQueryLocator(query);  
    }
    global void execute(database.BatchableContext bc, list<event> Scope)
    {   
        
        List<Messaging.SingleEmailMessage> mails = new List<Messaging.SingleEmailMessage>();
        messaging.SingleEmailMessage Email=new messaging.SingleEmailMessage();
        list<string> EmailId=new list<string>();
        String str = '' ;
        String finalStr= '' ;
        
        Map<Id,List<Event> > EventMap = new Map<Id,List<Event> > ();
        List<Event> EventList=new List<Event>();
        List<Event> EventList1=new List<Event>();
        
        for(Event e:EventList)
        {
            if(!EventMap.containsKey(e.OwnerId))
            {   
                EventMap.put(e.OwnerId, new List<Event>());
            }
            EventMap.get(e.OwnerId).add(e);
        }
        for(Id i:EventMap.KeySet())
        {
            EventList1=EventMap.get(i);
            EmailId.add(EventList1[0].owner.email);
            
            
        
         
            for(event e:EventList1)
            {  
                         
               str += '<tr><td>'+ e.Subject +'</td>'+'<td>'+ e.StartDateTime +'</td>'+'<td>'+ e.EndDateTime +'</td>'+'<td>'+'<a href="https://ap2.salesforce.com/'+ e.ID +'">Click Here</a>'+'</td></tr>' ;  
                 
               str = str.replace('null' , '') ;  
               finalStr = '' ; 
               finalStr = '<table border="1"> <td> Subject </td> <td> Start Date </td> <td>End Date </td> <td>Event Record </td> '+ str +'</table>' ;  
               
    
           }
           
           email.setSubject('Event Alert');
           email.setToAddresses(EmailId);
           email.setHTMLBody('Hi , Details of today\'s events are listed below:' +finalStr);
                
           mails.add(email);
           Messaging.sendEmail(mails);
         }  
         
    }
    global void finish(Database.BatchableContext BC)
    {
    }
}