The phrase "demonstrations worldwide" is grammatically correct and can be used in written English.
It refers to protests or marches that occur in various countries around the world. Example: "The recent climate change demonstration was not just limited to one city, but it sparked a series of demonstrations worldwide, with people coming together to demand action from their governments."
I have read online that there have been hundreds and hundreds, even over a thousand Black Lives Matter demonstrations worldwide since its inception.
The Raelians have declared June 23 "World Swastika Rehabilitation Day," and members plan demonstrations worldwide, including Los Angeles, Chicago, Vancouver, Miami, Houston and New York.
The demonstrations worldwide have emboldened those camped out at Manhattan's Zuccotti Park, the epicenter of the movement that began a month ago Monday.
The success of this demonstration aroused worldwide excitement and led to the formation of the American Marconi Company.
The women made their stand on International Women's Day, less than a week after Gbagbo's soldiers killed seven women at a peaceful demonstration, earning worldwide condemnation.
The group also called for a series of large-scale battery demonstration projects worldwide to show that renewable energy can be stored at the scale needed.
This paper reports the key findings and conclusions of a study that analyzes the financing of large-scale CO2 Capture and Storage (CCS) demonstration projects worldwide.
In conclusion, this bibliometric study provides a demonstration of worldwide research activity on khat.
The scale of anti-war sentiment surged globally as demonstrations became a worldwide phenomenon.
Before the 2008 Olympics in Beijing there were worldwide demonstrations by human-rights activists over Chinese oppression in Tibet, where two monks set themselves alight.
The protest was part of worldwide demonstrations against a video filmed in the US that portrayed the Prophet engaged in offensive behaviour.
