The John Frum movement is one of the most studied cargo cults in the world — a Melanesian religious movement that developed in the late 1930s on Tanna in response to colonialism and Christianisation. Followers at Lamakara village hold weekly Friday ceremonies where red-uniformed men march with bamboo rifles in a ritual believed to summon the return of John Frum and the material abundance he promised.
Respectful visitors are generally welcome at the Friday ceremonies, which take place at Lamakara (south of Sulphur Bay, near the volcano). Asking permission before photographing is essential, and arriving with a guide who has an existing relationship with the community is strongly advised. The ceremonies are genuine religious observances, not a tourist performance — approach them accordingly.