Searched for https://www.ioc-unesco.org/index.php?end=2018-06-30&headGroupID=All&option=com_oe&start=2018-03-01&task=eventCalendar 
Note: This calendar view maps the number of captures of https://www.ioc-unesco.org/index.php?end=2018-06-30&headGroupID=All&option=com_oe&start=2018-03-01&task=eventCalendar, not how many times the site was actually updated.
Look Up URL in general Internet Archive web collection.