There’s an art blog called still eating oranges and they made a fairly popular post called The significance of plot without conflict.
While unfortunately that post seems to mix up plot and narrative structure (or even a revealing of information), maybe the idea they talked about can be applied to either.
Anyways, here’s another very basic plot that has no conflict: someone has a desire, and so that person takes an action to satisfy that desire.
You may not realize it, but this simple plot is very popular.
Where, you ask? The porn industry! The desire is “to have sex” and this causes the characters to have sex. This is a logical cause and effect, a plot. Though, of course, plenty of porn films have plots that are different from this.