Plot is about action/reaction, events and consequences. Yes. But there are conceivably stories that have no apparent reactions, or consequences. Then indeed, you end up with a story that is just series of events. Stories purely about themes and ideas.
Or a story that is weak on these reactions and consequences -- thus a story with a weak plot.
Say, if you have a story about five people who sit around talking about books at a cafe every week. Then they go home and live their lives, but noting really happens. Then they go back to the cafe and muse about life again. Then they go home and live their lives -- rinse and repeat. You may have a philosophical story that involves these characters and their lives, but nothing is of consequences or resolutions. That's what I mean by "the story being the ideas."
If you have a story about the king who died, then the queen died, and then the people all got killed by a meteor. It's a story without plot. However, if you have a story about the king who died, then the queen died of grief, and because of that, the people elected a President who is too incompetent to realize a meteor is heading toward Earth, and then everyone died at the end -- that would be a story with a plot because there are events and consequences. The point is, there are, in fact, stories without consequences.