I know that the major prophets did two major things: called for Israel to repent of whatever evil they were doing at the time and foretold the coming of Christ.
But what about minor acts of prophecy? In 1 Samuel we read
"As Saul turned to leave Samuel, God changed Saul’s heart, and all these signs were fulfilled that day. 10 When he and his servant arrived at Gibeah, a procession of prophets met him; the Spirit of God came powerfully upon him, and he joined in their prophesying. 11 When all those who had formerly known him saw him prophesying with the prophets, they asked each other, “What is this that has happened to the son of Kish? Is Saul also among the prophets?"
(Side question: Why didn't anyone write down what was being prophesied? Seems like that would be more significant than the fact that prophesy was occurring, right?)
In Acts, Peter references Joel to say that "your sons and daughters will prophesy." Is that something as simple as when we say things like "our culture is headed in the wrong direction, we need to do XYZ," or is there more to it?