I was notified by Jitka Erbenová/Cheva about server side cache problem at https://outreachdashboard.wmflabs.org/courses/Jiho%C4%8Desk%C3%A1_v%C4%9Bdeck%C3%A1_knihovna/SePW_v_JVK_%C4%8CBu_(podzim_2017) . But the user interface displays ANOTHER information than the EDIT ONE. See screenshots below.
How can I purge the cache?
The events are in less than in month, so I consider this as unbreak now.
Martin Urbanec / Urbanecm
Wikimedia Czech republic