come along for the ride
To accompany one to an event or activity without being significantly involved in it. Oh, I'm just coming along for the ride with the rest of the department—I'm not presenting at the conference or anything.
along for the ride, to go/to come/just
To take part but passively. The phrase, originating in the United States in the mid-twentieth century, implies some of the acquiescence of go along with but makes it clear that one is not in the driver’s seat.