Html 5 is poop, but it's down to preference i suppose, ive had a look at your tables and got it down to 1 validation error, if you need anymore help id be happy to assist





<table width="80%" border="1">
<thead>
<tr>
<th width="21%">Name of Artist</th>
<th width="25%">Location</th>
<th width="21%">Date</th>
<th width="15%">Start Time</th>
<th width="18%">End Time</th>
</tr>
</thead>
<tbody>
<tr>
<td>Billie-Jean Heslop</td>
<td>Victoria and Albert</td>
<td><div style="text-align: center">11th November 2014</div></td>
<td><div style="text-align: center">10:00 AM</div></td>
<td><div style="text-align: center">5:00 PM</div></td>
</tr>
<tr>
<td>Billie-Jean Heslop</td>
<td>British Museum</td>
<td><div style="text-align: center">15th November 2014</div></td>
<td><div style="text-align: center">1:00 PM</div></td>
<td><div style="text-align: center">6:00 PM</div></td>
</tr>
<tr>
<td>Billie-Jean Heslop</td>
<td>National Gallery</td>
<td><div style="text-align: center">20th November 2014</div></td>
<td><div style="text-align: center">10:00 AM</div></td>
<td><div style="text-align: center">4:00 PM</div></td>
</tr>
<tr>
<td>Robert MacPherson</td>
<td>National Gallery</td>
<td><div style="text-align: center">29th November 2014</div></td>
<td><div style="text-align: center">1:00 PM</div></td>
<td><div style="text-align: center">4:00PM</div></td>
</tr>
<tr>
<td>Charlie Parvin</td>
<td>Brtish Museum</td>
<td><div style="text-align: center">20th January 2015</div></td>
<td><div style="text-align: center">9:00 AM</div></td>
<td><div style="text-align: center">12:00 PM</div></td>
</tr>
<tr>
<td>Charlie Parvin</td>
<td>British Museum</td>
<td><div style="text-align: center">21st January 2015</div></td>
<td><div style="text-align: center">9:00 AM</div></td>
<td><div style="text-align: center">12:00 PM</div></td>
</tr>
</tbody>
</table></body>
</html>