1. The Hitler Society. Composed of 20th- and later-century adventurers who have successfully travelled back in time to kill Hitler, the Hitler Society has open meetings in Wellington, New Zealand five days before the turn of the 22nd, 23rd, 24th and 25th centuries for members to compare their experiences and to commiserate. To meet in the current timeline, of course, members of the society must subsequently have had their work undone, either by themselves or others. This may be variously in horror at the alternative future they spawned, due to a change in beliefs about the morality of meddling in the past, accidentally, or by the intervention of time-travelling neo-nazis. Rumour has it that there are a number of alternative Hitler Societies in timelines where Hitler has remained killed, and several of the Society’s members have experimented with killing Hitler in different time periods in the hope of accessing these timelines, returning after each instance to discuss with their earlier selves the merits of each approach. Although one would expect a coherent narrative about successful methods to arise from the eventual non-appearance of these members, this has so far regrettably not been the case.
2. The Time Travel Dinner and Dance Club. Unlike most of the other societies, this club is not particularly concerned with great historical events. Rather, they enjoy the companionship of other time travellers for its own sake. Members maintain a list of times and places where particularly good ingredients for fine dining are to be had and the musical fashions are to the taste of the majority; the agreement of at least twelve members is necessary for a Meeting to be called in each time and place. At the meeting, members discreetly engage local chefs and musical practitioners to provide a nice, non-challenging dinner and a short, usually rather sedate, dance, held in whatever the equivalent of a local church hall is in that time period.
3. The Long Way Society of Time Travellers. This society consists of people who have discovered at least one of the seven secrets of time travel, but have chosen not to exercise their time travelling abilities. Meetings of the Long Way Society are thus only attended by people for whom the meeting falls within their natural lifespan, and typically consist of a mixture of the lucky and the extremely long-lived. In 1980, a meeting of the Society in New York was mistaken for a coach tour of elderly Floridians and had a surprisingly humorous adventure. We mention this because, should you happen to attend a meeting after this date, you will likely run into two or three elderly members who will not shut up about the incident.
4. The Johanssonists. The main criterion for membership of the Johanssonist society is to have used time travel to perform some kind of prank at a major historical event, evidence of which must not have found its way into official histories. For example, the society’s five founder members have variously: made fart noises during the election of Pope Martin V; briefly done a silly walk behind Richard III at the battle of Bosworth Field; attended the suicide of the Chongzen Emperor in a clown mask; put a small amount of laxative in Winston Churchill’s tea at an unspecified point during the Second World War; and distributed banana skins on the ground in Sao Paulo before the Brazilian Day of Anger. The Johanssonists have only one historical meeting point, thought to be on the ocean liner Elizabeth III shortly prior to her scrapping in 2110, in the middle of the Pacific Ocean. Applicants to the society are only allowed to materialise on deck and must give their application story within five minutes; unsuccessful applicants face being abducted and dropped off in central Greenland at a random point in history.
5. The Big Bangers. This society consists of those who have travelled backward in time to see the Big Bang. As it turns out, Zhang & Porter’s New Inflation Theory means that one can only travel backward to the publicly accessible times close to the Big Bang (i.e. times in which a human spacecraft can exist with reasonable shielding precautions). Forward travel at this time point is subject to the familiar one second per second speed limit. The Big Bangers are thus a rather isolated society and typically team up only for the companionship of starving to death together in remarkably unpicturesque surroundings. Most set off prior to the time of Zhang and Porter, although occasional kindly-minded souls have later travelled to join the Big Bangers with food and medical convoy ships.
6. The Earth Observation Society. This consists of time travelling alien beings who have a particular interest in humans. These interests are thought to range wildly, from the purely academic to the purely culinary; a surprisingly large contingent are thought to be in the human hormone trade. No details of their meetings are made available to humans, but it is believed they are typically held in near Earth orbit with optional visits to the planet’s surface for those who are able to tolerate the atmospheric conditions. Rumour has it that a Sagittarian Phage ate most of the society after an acrimonious meeting in 18870, leading to a period of highly complex timelines.
7. Prof. Wang’s Atemporal Cat Fancy. The members of Prof. Wang’s society do not have formal meetings but frequently encounter each other. Membership criteria are very loose and members often only find that the Society exists after they have begun to carry out Societally-appropriate activities. The Society specialises in picking out particularly interesting historical cats and travelling to pet them. The largest gathering of members is thought to be on the 18th of October 2015, when at least seven members independently travelled to Antarctica to pet Mrs. Chippy, the carpenter’s cat aboard Shackleton’s Endurance, the night before she was shot following the abandonment of the ship. Other targeted cats include Muezza, Christoper Smart’s cat Jeoffrey, and CC, the first cloned cat.