Hi Susanne,
Can you try using the Default Events Template and override and customize it (following the steps in the Themer’s Guide), so that instead of:
get_header(); ?>
<div id="tribe-events-pg-template">
<?php tribe_events_before_html(); ?>
<?php tribe_get_view(); ?>
<?php tribe_events_after_html(); ?>
</div> <!-- #tribe-events-pg-template -->
<?php get_footer(); ?>
You have something like:
get_header(); ?>
<div id="tribe-events-pg-template">
<?php tribe_events_before_html(); ?>
<?php tribe_get_view(); ?>
<?php tribe_events_after_html(); ?>
</div> <!-- #tribe-events-pg-template -->
<div id="tribe-events-pg-sidebar">
<?php dynamic_sidebar( 'custom_events_sidebar' ) ?>
</div>
<?php get_footer(); ?>
And add appropriate CSS rules to your stylesheets from there?