I have a template for a Custom Object Business_Trip__c with Child relationship to Event via Custom Lookup.
I want to show related meetings.

Template below:

    <p><b>Planned Meetings:</b></p>
    <table border="1" >
        
        <apex:repeat var="cx" value="{!relatedTo.Meetings__r}">
            <tr>
                 <td>Name: {!cx.WhoId}</td>
                 <td>Date: {!cx.ActivityDate}</td>
                 <td>Company: {!cx.Whatid}</td>
                 <td>Subject: {!cx.Subject}</td>
                 <td>Notes: {!cx.Comments_Summary__c}</td>
            </tr>
             
        </apex:repeat>                 
    </table>
    <p />

Provides indecipherable results:

Planned Meetings:
**Name: 003J000001EWnkiIAD**    Date: Thu Jul 09 00:00:00 GMT 2015    **Company: 001J000001btDA7IAM**    Subject: Quarter review

When what I want is:

**Name: Joe Conact** Date: Thu Jul 09 00:00:00 GMT 2015    **Company: AcmeWidgetCo**. Subject: Quarter review

How do I get the names - the Contact and Account names -  from the relation? thanks!

I have tried:

<td>Name: {!cx.Who}</td> - Causes big error on test send

<td>Name: {!cx.WhoId.name}</td> - gets Error: Unknown property 'String.name'    

<td>Name: {!cx.WhoId__r.name}</td> 

and
<td>Name: {!cx.Who__r.name}</td>

Both get -     Error: Invalid field WhoId__r for SObject LookedUpFromActivity