The phrase "active crowds" is correct and usable in written English.
It can be used to describe groups of people who are engaged, participating, or involved in a particular activity or event.
Example: "The festival attracted active crowds, eager to enjoy the performances and activities throughout the day."
Alternatives: "engaged audiences" or "participating groups".
As the mood and object become established, either an "active" crowd or an "expressive" crowd is formed.
The active crowd normally ends with a tapering-off period, which is sometimes preceded by a stage of siege.
According to this view an expressive crowd can fairly quickly metamorphose into an active crowd if an object becomes apparent to them.
"We wanted to target a more physically active crowd," said Dean Rand, the captain of The Discovery and the company's owner.
Its committee meetings are well attended; reviews of liquor license applications "always draw a good-sized and very active crowd," he said.
The active crowd is usually aggressive, such as a violent mob, though occasionally it acts to propel members into heroic accomplishments.
The most sensitive and difficult control problem occurs at the moment of the first precipitating incident and during the stage of transformation in an active crowd.
The active crowd identifies an object or group of objects outside itself and proceeds to act directly upon it or them.
Any doubts that delegates were fired up was dispelled by the reaction from the floor of the convention, with a noisy, active crowd that made more noise than their Republican counterparts.
One interpretation is that the same determinants of social unrest and frustration may give rise to both the expressive crowd and the active crowd, but the expressive crowd fails to identify an object toward which to act; hence members must release accumulated tension through motions and gestures expressing emotion.
