If you want all the normal bells and whistles of the EventsViewer module, like with the action menus and workflow-actions and field-clicking behavior and all that then you'll have to get into some complex stuff with a custom event renderer. Here are some docs http://docs.splunk.com/Documentation/Splunk/5.0.1/AdvancedDev/EventRendering
If you're using a relatively recent copy of Sideview Utils though (2.2 or greater), then you can use the Multiplexer module with an HTML module, instead of the EventsViewer. The advantage there is that you don't need any custom code at all - it looks like this:
<module name="Multiplexer">
<param name="fields">desc</param>
<module name="HTML">
<param name="html"><![CDATA[
<b>this is some static HTML, followed by the HTML in the desc field on the next line</b><br>
$desc$
]]></param>
</module>
</module>
Multiplexer is definitely a peculiar module. It's not a module anyone needs or uses very often. In fact you can probably get by without ever using it for anything ever. But when you do need it for something, it can be crazy useful. What it will do in this simple example, is create a copy of that HTML module for every row in the current search results, and in each of those cloned HTML modules, the $desc$ key will have the value of the $desc$ field in that row of the search results. You can also multiplex any number of modules so you can next complex configs with PostProcess and JSCharts and really powerful config in there if you ever need it.
There's a decent amount of docs dedicated to Multiplexer in Sideview Utils itself under "Module Documentation > Advanced Modules > The Multiplexer Module"
