The health situation remains too "uncertain" for the "most comprehensive gathering of all" to be held in the autumn, Bavarian Minister-President Markus Söder said at a press conference.
In an historic move Germany has agreed to repatriate hundreds of Benin Bronzes in the Humboldt-Forum museum in Berlin to Nigeria next year.
The four victims were found dead in separate hospital wards by police on Wednesday night. A fifth resident was seriously injured.
The country's domestic security agency can now monitor people and groups within the so-called 'Querdenker' movement.
A suspected WWII hand grenade found in a Bavarian forest was actually a rubber sex toy, German police have said.
The challenge mostly targeted the issuance of an EU common bond to raise money for the €750-billion recovery fund.
Bavarian leader Markus Söder and Merkel loyalist Armin Laschet have both thrown their hats in the ring to run as the conservative bloc's candidate for German chancellor.
"We the survivors are fading away but I hope that this process of remembrance will continue, said Alex Hacker, who was a prisoner at the Mittelbau-Dora concentration camp.