"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.
"We must all pull together, my dear fellow Germans," urged President Frank Walter Steinmeier in a rare televised address on Saturday.
Italy plans to introduce a five-day quarantine for travellers from EU countries, while Germany will strengthen border checks.
In a surprising decision, the court prevented the German President from signing off the ratification of the legal text that would enable the Commission to raise funds on the capital markets.
EU countries are leading the way on renewables but more needs to be done to reach Paris Agreement targets.
Chancellor Merkel was due to relax restrictions at a meeting with regional leaders on Monday but a surge in infections has upended those plans.
A long-awaited report into abuse in the Catholic church in Cologne found hundreds of children have been sexually abused since 1975, with high-ranking officials neglecting their duties to report cases.
Germany has begun exiting lockdown but health officials warned that the situation remains tense amid a rise in infections.
German police say they have solved a nine-year-old burglary using DNA on a half-eaten piece of sausage.
Merkel's chief of staff says Germany can return to full normality in the summer if vaccine manufacturers keep to their delivery pledges and no new coronavirus mutation upends vaccination plans.