Research is being carried out by the Marine Conservation Society following mass strandings of moon jellyfish in north Wales.

BBC: Lion's mane jellyfish

Sun Myung Moon's Unification Church is best known through events like its mass weddings, where thousands of couples are married at the same time, having only just met their lifetime partner.

BBC: Obituary: Sun Myung Moon

La Masa Critical (Critical Mass) takes over the streets of the Argentine capital on the first Sunday of each month and every full moon, and the route is completely spontaneous each time.

BBC: Buenos Aires�� Critical Mass