This is a plugin for JEvents, available to Silver club members. It allows you to associate Joomla articles with events.
There are 2 types of article:
You can include a link to the article within the event description or choose to auto-redirect to the article itself (this is a plugin config option).
You can also create an article based on the event description and title at the same time as editing the event. This created article will use a content plugin to offer a link back to the event. You can also set the plugin so that the article will auto-redirect to the event description. It is not a good idea to auto redirect in both directions (for reasons that should be obvious !).
See the demo images/video tab to see this in action