Example of using Preload Replace to make your code a bit DRYer.

agenda-index.html

{preload_replace:c='agenda'}
{exp:channel:entries
  channel='{c}'
  limit='5'
  dynamic='no'
}
<article>
  <h2>{title}</h2>
  <img src="{{c}_image_main}" alt="{title}">
  {{c}_text_body}
</article>
{/exp:channel:entries}