Dubai, May 24: The UAE Jiu-Jitsu Federation (UAEJJF) has announced the closure of registration for the highly anticipated Challenge Jiu-Jitsu Festival amid an overwhelming response from participants. With over 2,500 participants already registered, the upcoming event at the Mubadala Arena in Zayed Sports City from May 26-28 is expected to be a momentous gathering for the wider jiu-jitsu community, as well as families in attendance.