Knight Terrors was a different kind of event book. While there were the requisite miniseries containing the main story, instead of having crossover issues take over DC's line, it put everything on pause for two months, replacing DC's comics with two issue miniseries. This gave readers a choice that most event books don't give them. They could dive into the event or they could sit out the story if they didn't like it.
Source：https://www.cbr.com/dc-linewide-crossover-events-not-knight-terrors/
