John Lightfoot on Luke 12:1

[When there were gathered together an innumerable multitude of people.] There is no one would understand this in the very letter of it; as if the number of the people here present were at least twenty thousand, but a very great number. So Acts 21:20: How many myriads of Jews which believe.

This probably denotes the mighty success of the seventy disciples preaching the gospel, who had so clearly and effectually taught concerning Christ, and told them of the place that he had determined to come to, that the people had flocked together in those vast numbers, ready upon all occasions to meet him, when they heard the Messias was making his approaches to this or that town.