Germany's health minister urged organisers of public events with more than 1,000 participants to call them off, news agency DPA reported on Sunday.
A number of large events, including a travel fair in Berlin, have already been called off, but Jens Spahn said other organisers had been too slow to act.
"Given how fast things are developing, that should change quickly," he was quoted as saying.
Under Germany's federal system, the health minister does not have the power to call off individual events, but a strong lead from the federal government typically encourages federal states to follow suit.
Germany has been criticized for still going ahead with large sporting events such as the Bundesliga football games, while elsewhere in Europe similar events are being cancelled or held behind closed doors.
On Sunday, Germany had a total of 847 coronavirus cases, according to the country's official disease control institute.
Coalition leaders are due to meet later to discuss how to shield Europe's largest economy from the outbreak.
