With a "validating" page naming strategy one cannot create new events

Since XWiki supports the "page naming strategy", it is possible that some page names are rejected if they do not match the name strategy. If the setting "Validate names before saving" is enabled, then the page names proposed by the calendar might not be valid, especially if one uses the "preformatted names" strategy.

That the calendar chooses page names on its own that violate the name strategy makes adding new calendar event impossible. Even worse, the calendar provides zero feedback about the problem; it just closes the "new event" edit modal, reload the calendar, and shows that the calendar event has not been changed. The user input is thrown away and is lost.

The only workaround is it disable the "Validate names before saving".