Results will be sorted on Startdate in Descending order.
</pre>
'''To sort on custom field''':
<pre>
<table> [#(?object=activity;orderby=tbl_custom field id.valuestr)<tr><td>~location~</td><td>~startdate~</td></tr>#]</table>
</pre>
'''Example''':
<pre>
<table> [#(?object=activity;orderby=tbl_xxxxxx.valuestr)<tr><td>~location~</td><td>~startdate~</td></tr>#]</table>
xxxxxx= custom field id
</pre>