The phrase "a modest crowd of" is correct and usable in written English.
It can be used to describe a gathering of people that is not large or overwhelming, often implying a sense of humility or simplicity.
Example: "At the local park, there was a modest crowd of families enjoying the sunny afternoon."
Alternatives: "a small gathering of" or "a humble group of".
Addressing a modest crowd of voters here, Mr. Gingrich said he had asked Gov. Rick Perry of Texas, who dropped out of the race and endorsed him two weeks ago, to help him develop "the strongest possible Republican platform plank for the summer".
A modest crowd of 8,000 is expected.
Around us was a modest crowd of thirty or forty, with the dark winter clothes and the weather-beaten faces of hill and mountain people.
After a brief interview by Storme Warren, a SiriusXM radio host, she did her best to overcome the room, performing for a modest crowd of about 200, many of whom appeared to be affiliated with one sponsor or another.
At four in the afternoon on the Fourth of July, ten adventurous women and a modest crowd of witnesses and moral supporters gathered at Hollister's only bowling alley for a preliminary round of the Hollister Independence Rally pageant.
It took a second-half substitute, striker Lauren Cheney, to produce a moment of brilliance and elation when she scored the only goal — on a shot from 25 yards in the first minute of added time — in the United States' 1-0 victory before a modest crowd of 5,852 at Red Bull Arena.
I find no evidence for substitution between young full-time workers and elderly workers, while there might be a modest crowd out of middle-aged female part-time workers.
Anticipating a hardly modest crowd of 60,000, organizers turned out to have vastly underestimated demand when some 250,000 carousers descended on the seaside city.
Just under a month later United lost the return fixture at Olive Grove 4 1 in front of a more modest crowd of just under 12,000.
In front of the Vrijthof theatre, a modest crowd was assembled, soon to be scattered by the arrival of a dark blue coach.
In December , 1986 Andrey Sakharov, released by Mikhail Gorbachev, was met by a modest crowd as he arrived from his exile in the city of Gorky.
