The protesters filled many blocks of one of Caracas’s main avenues, many of them wearing white shirts to symbolize peace. The protests are expressing the widespread discontent with the government of President Nicolás Maduro, a socialist who has vowed to carry on the revolution of the country’s charismatic longtime president, Hugo Chávez, who died last year.

“The one who is responsible for all this is Maduro, for his incendiary discourse,” said Derek Redman, 77, who attended the march. His son, Roberto Redman, 31, was shot to death during a protest on Feb. 12. “I will not stop marching now that my son is dead. This situation can change if we don’t lower the pressure.”

Demonstrations were held in several other cities as well.

The government continues to ignore the vast majority of demonstrators, who have acted peacefully, and instead focuses attention on acts of violence and property damage that have been associated with some of the protests. At least four people have been shot to death.

In a speech in Caracas after a march organized by the government that was billed as a rally of women for peace, Mr. Maduro held up a small explosive filled with nails that he said was seized by security forces and could have been used by opponents of his government to attack soldiers.

“This is terrorism,” he said. “Fascist, spoiled, rich kids!”