Today I discovered a bug in the Wordpress Plugin EventON, that malforms the Date-View.
The Cause for this bug is, that jquery gets loaded over http, instead of https. So if your site is running on https, the Script gets blocked, due to the mixed-content Policy, that all major browsers use.
In the file wp-content/plugins/eventON/admin/eventon-admin-init.php, remove at line 948 the http, so only the // is left. This way, the browser loads it over http, if the page itself is beeing loaded over http and over https, if the page got requested over https.
The same is also true for the eventon-action-user - Plugin. It may be true for all Plugins of this author, but we are only using these two Plugins.