Hi
I want to hide save and send update button in Event edit page. In Salesforce , these save and hide button will be visible only when u add invitees more than 1 user.

I have tried to create a custom visualforce page similar to Event edit page but i'm not not able to add the related list Attachments and Invite Other details
The following is my code

VF page:

<apex:page standardController="Event" extensions="CustomVisitController" showHeader="true">
  <apex:form >
  <apex:pageBlock title="Calendar">
  <apex:pageBlockButtons >
  <apex:commandButton action="{!Save}" value="Save"/>
  <apex:commandButton action="{!saveAndNewTodo}" value="Save & New To do"/>
  <apex:commandButton action="{!saveAndNewVisit}" value="Save & New Visit"/>
  <apex:commandButton action="{!cancel}" value="Cancel"/>
  </apex:pageBlockButtons>
  <apex:pageBlockSection title="Visit Details (Only create visits from a Contact)" columns="4">
   <apex:inputField value="{!Event.Ownerid}">
  <apex:actionSupport event="onchange" rerender="Event_view" action="{!rerender}">
  <apex:param name="ownerId_VF" value="{!Event.Ownerid}" assignTo="{!ownerId_VF}" />                    
  </apex:actionSupport>
  </apex:inputField>
  <apex:inputField value="{!Event.Type}" />
  <apex:pageBlockSectionItem ></apex:pageBlockSectionItem>
  <apex:pageBlockSectionItem ></apex:pageBlockSectionItem>
  <apex:inputField value="{!Event.Subject}"/>
  <apex:inputField value="{!Event.StartDateTime}">
  <apex:actionSupport event="onchange" rerender="Event_view" action="{!rerender}">
  <apex:param name="startDate_VF" value="{!Event.StartDateTime}" assignTo="{!startDate_VF}"/>
  </apex:actionSupport>
  </apex:inputField>
  <apex:pageBlockSectionItem ></apex:pageBlockSectionItem>
  <apex:pageBlockSectionItem ></apex:pageBlockSectionItem>
  <apex:inputField value="{!Event.Whoid}"/> <!--<apex:commandLink value="[Add to Invitees]"/> -->
  <apex:inputField value="{!Event.EndDateTime}"/>
  <apex:pageBlockSectionItem ></apex:pageBlockSectionItem>
  <apex:pageBlockSectionItem ></apex:pageBlockSectionItem>
  <apex:inputField value="{!Event.Whatid}"/>
  <apex:inputField value="{!Event.IsAllDayEvent}"/>
  <apex:pageBlockSectionItem ></apex:pageBlockSectionItem>
  <apex:pageBlockSectionItem ></apex:pageBlockSectionItem>
  <apex:inputField value="{!Event.Location}"/>
  </apex:pageBlockSection>
  <apex:pageBlockSection title="Visit Notes - Use Description field for visit, and follow-up notes">
  <apex:inputField value="{!Event.Description}"/>
  <apex:pageBlockSectionItem ></apex:pageBlockSectionItem>
  </apex:pageBlockSection>
  <apex:pageBlockSection title="Recurrence">
  <apex:inputField value="{!Event.IsRecurrence}"/>
  </apex:pageBlockSection>
   <apex:pageBlockSection title="Reminder">
  <apex:inputField value="{!Event.IsReminderSet}"/>
  </apex:pageBlockSection>
  <apex:pageBlockSection >
 
 
  </apex:pageBlockSection>
 
 
  </apex:pageBlock>
 
   <apex:pageBlock title="Attachments">
  <apex:commandButton value="Attach File" action="{!attachfile}"/>
  </apex:pageBlock>
  </apex:form>

 
</apex:page>

Controller

public with sharing class CustomVisitController {

    public CustomVisitController(ApexPages.StandardController controller) {
       
    }
    
    Public PageReference rerender() {
    
    return null;
    }
    
    Public PageReference saveAndNewTodo() {
     try{
            Event eve = new Event();
             upsert eve;
        }        
        catch(Exception e){
            ApexPages.addmessage(new ApexPages.message(ApexPages.Severity.ERROR,'Error creating/updating record'));
        }
        PageReference pageRef = new PageReference('https://cs11.salesforce.com/00T/e?retURL=%2Fhome%2Fhome.jsp');
        pageRef.setRedirect(true);

        return pageRef;   
    
    }

     Public PageReference saveAndNewVisit() {
     try{
            Event eve = new Event();
             upsert eve;
        }        
        catch(Exception e){
            ApexPages.addmessage(new ApexPages.message(ApexPages.Severity.ERROR,'Error creating/updating record'));
        }
        PageReference pageRef = new PageReference('https://c.cs11.visual.force.com/apex/CustomVisitPage');
        pageRef.setRedirect(true);

        return pageRef;   
    
    }
Public PageReference attachfile(){

Attachment a = new Attachment();
upsert a;
return null;

}


}

Please guide let us know how to go further. Thanks