Aegaeus & Tribe Events

I am using Tribe Events with Aegaeus but the events overview switches to a page with sidebar and I cannot find how to change this to a fullwidth page instead: do I change this in the Aegaeus (child) theme or in the Tribe css?

The webcode states:
<!– START #sidebar-page-wrapper–>
<div id=”sidebar-page-wrapper” class=”clearfix”>

<!– START #main-content-with-sidebar” –>
<div id=”main-content-with-sidebar” class=”col-8″>

Example page: http://www.wachtum.nu/activiteiten/2015-04/