DPCalendar - com_dpcalendar (Pro feature)
CComment comes with a plugin forDPCalendar. Go to your Joomla backend -> components -> CComment ->settings -> new, from the component dropdown field select com_dpcalendar and click next. Save the configuration.
Now go to Extensions -> Plugin Manager -> find the DPCalendar - CComment plugin and enable it. Now when you go in single view of an event you should see the comment form.