The phrase "all called upon" is correct and usable in written English.
It can be used when referring to everyone who has been asked or summoned to participate in a task or event.
Example: "During the meeting, all called upon were given a chance to share their thoughts on the project."
Alternatives: "everyone summoned" or "all requested".
The United States, Canada, Taiwan, the European Union, the United Nations and Amnesty International have all called upon the Chinese government to release him.
When tragedies such as the earthquake in Nepal strike, we are all called upon to act, be it through active participation in relief efforts, donations, prayers or reflection.
During the entire development process, coaches, colleagues, bosses, and mentors were all called upon to provide her with constant, encouraging feedback.
Mr. Boyd told the audience of about 100 people that "these are extraordinary times and we are all called upon to act with courage".
"We were all called upon to collect clothes and food for the disaster victims," recalled Jelle de Boer, a Dutch high school student at the time who is now an emeritus professor of geology at Wesleyan University.
Revered directors such as Steven Spielberg (in AI: Artificial Intelligence), Martin Scorsese (Gangs of New York) and Danny Boyle (28 Days Later) have all called upon him to help flesh out their distinctive visions; last week he popped up in Green Zone as a gruff CIA operative, and stole the show.
— all calling upon the commission to hold a hearing, lest this historic work by a great American architect be destroyed without a second thought.
After all, calling upon Baphomet and/or playing Firewatch takes absolute concentration and I don't want humans intruding on my reverie.
I meditate, you meditate; We all call upon techniques to sooth the spirit.
That is why we are all calling upon the Commission together to present a new legislative proposal seeking to phase out these substances or to limit specific applications within three years of the entry into force of this regulation.
In the meantime, we may not all be called upon to act as heroically as the Smiths did in the midst of the historic blizzard.
