I take this discussion on the events calendar to let you serious problem with the WordPress platform.
In the summer of 2013, a sysadmin installed at my request, the extension “Full Calendar Js” that worked very well with the WP version of the time. But after the great migrations of spring 2014, many extensions have been gradually uninstalled without notifying local webmasters.
Since 2015 until last week, I was very busy as a volunteer to coordinate and prepare the #OKFestMTL April 12 hosted by WWW2016.ca. My availability is now back to normal regarding the maintenance of the local group website in Canada.
The extension Full Calendar Js allows to integrate into a WordPress page many calendars in the Google XML format or --other XML / RSS feed.
I wish to integrate okfn austria calendar to our calendar page that integrates the collective “Agendu Libre” Facil Quebec. But our multiple calendar stops working ;-( See: http://ca.okfn.org/agenda-libre/ with http://agendadulibre.qc.ca/event/2016/4/ (an open source plafeform).
In my humble opinion, 1) Excel file is less reusable than Google XML or XML / RSS feed ; 2) The WorPress extensions are not used enough.
I am available to discuss with you and the sysadmin to advance this project in an collaborative approach.
Please apologized my english