Universal's Halloween Horror Nights is an annual Halloween-themed event at Universal Studios theme parks in Orlando, Hollywood, Japan and Singapore. The longest-running and most successful iteration of the event, in Orlando, Florida, began as Universal Studios Fright Nights in 1991 as a 3-night event at Universal Studios Florida. The following year, it was re-branded as Halloween Horror Nights, advertised as the "second annual event". Since then, it has evolved into a scare-a-thon event filled with themed haunted houses, scare zones and shows that runs over the course of select nights from late August/early September until late October/early November, inspiring offshoots at other Universal Studios locations across the globe.