The only way I know to do this is to edit the file gacl.class.php in the includes directory.
Look for the section // access to components
And then add a line such as
$this->_mos_add_acl( 'administration', 'edit', 'users','manager', 'components', 'com_eventlist' );
You then have a second issue which is that managers do not have access to the components menu. I resolved this using equickicon from
http://extensions.joomla.org/component/ ... Itemid,35/. This replaces the exisiting icon panel and lets you set user levels to the icons. So all you have to do is to add a link to the component here and set the access level to manager.