There are several synonyms for the phrase "based on real-life events." Some alternatives include "inspired by true events," "taken from actual occurrences," and "drawn from factual accounts." Another option is "adapted from a true story," which is often used in the film industry to indicate that the plot is based on real events, but some artistic liberties have been taken. Similarly, "historically accurate" can also be used to convey that a work is based on real events and has been researched and portrayed accurately. Overall, there are numerous ways to describe works that are based on real-life events, and these synonyms can add variety and clarity to descriptions of such works.