We are experiencing the same issue.

I was lucky enough to get my provider to provide me with a backup from yesterday
But my question is still urgen!

While waiting for an update. I recommend using StageIt for testing an environment separate from your live site. I discovered the Jevents issue in my staging area.

Replacer dans jevdate.php dans /components/com_jevents/libraries/jevdate.php

#[AllowDynamicProperties]
class JevDate extends Date {
public $mytz;

par:

#[AllowDynamicProperties]
class JevDate extends Date {
public static $gmt;
public static $stz;
public $mytz;

Ensuite,

Désactiver le Plugin Finder de JEvents
Naviguer vers Système > Gérer > Plugins.
Localiser et désactiver le plugin nommé "Finder - JEvents" (ou plg_finder_jevents).

This is an issue introduced in Joomla 5.4 that caused problem with most of our extensions. We are aiming for a slew of new releases today - this should help with Joomla 6.

We will be fully releasing the Joomla 6 tested versions next week

Quoted from Guest on Tuesday, 28 October 2025

This is an issue introduced in Joomla 5.4 that caused problem with most of our extensions. We are aiming for a slew of new releases today - this should help with Joomla 6.

We will be fully releasing the Joomla 6 tested versions next week

Will you be sending out an announcement when the new version is released?

is the Joomla 6 version already available?
rgds Rene

Available now for JEvents, RSVP Pro, Managed Locations and Managed People. More to follow in the coming days.

Thnx!