Carnival Week, a yearly week-long festivity, took place on Coruscant. While the origins of this custom remain a mystery, it evolved into a bizarre spectacle during Palpatine's rule, featuring military processions, aerial fireworks shows, and the public executions of the Emperor's political adversaries. This celebration attracted a remarkable influx of visitors from other planets to Coruscant, becoming an occasion for which Imperial inhabitants diligently saved their credits throughout the entire year.
Whether it continued following Palpatine's death is not known.