Maasai Cultural Festival in Monduli/Ngorongoro
Monduli District, in Arusha Region, is a real center of Maasai population and culture in northern Tanzania, but no independently confirmed Maasai Cultural Festival by this specific name and date could be located there.
Wikipedia confirms Monduli as part of the Arusha Region and situates it within the broader Maasai cultural landscape of northern Tanzania; a related Wikipedia entry on the adumu, or Maasai jumping dance, confirms this ceremonial dance as a real tradition practiced by young Maasai warriors in both Kenya and Tanzania as part of the enkipaata coming-of-age ceremony.