The phrase "gathered a group of" is grammatically correct and can be used in written English.
Example: The teacher gathered a group of students to discuss the upcoming field trip.
"He gathered a group of artists who worked here into the nineteen-thirties, creating the dioramas.
"I have gathered a group of investors that could buy the place from Shalgham," he said.
So he gathered a group of 30 wealthy residents from his piney neighborhood.
Ms. Corey gathered a group of supporters at her Seymour home one recent Sunday night.
So he and his colleagues gathered a group of adult volunteers.
It gathered a group of fighters, had them live and train together and then compete for a UFC contract.
Ajengui gathered a group of girlfriends and boarded a tram to visit the Presidential palace, in Carthage, to tell him.
She gathered a group of volunteers at the center's office in downtown Baltimore recently to discuss their experiences.
This past summer, I gathered a group of 20 babies between the ages of 14 and 20 months.
In 1940, Churchill gathered a group of volunteers in the building and formed the SOE (Special Operations Executive).
In 1992, Mr. Mahoney and Dr. Watson gathered a group of neuroscientists at the Cold Spring Harbor Laboratory on Long Island.
