<tr>
  <td><a href="/#event/{_id}">{time}</a></td>
  <td>{parser}</td>
  <td>{preview}</td>
</tr>

<tr>
  <td><a href="/#event/{_id}">{time}</a></td>
  <td>{parser}</td>
  <td>{preview|s}</td>
</tr>

Remove escaping of preview blocks. Individual template vars in a particular preview template will get escaped (tested).
Remove escaping of preview blocks. Individual template vars in a
particular preview template will get escaped (tested).
