An "organised group" refers to a collection of individuals who come together with a specific purpose or goal in mind. They work together in a planned and coordinated manner to achieve their objectives. Full definition
On organised group tours, there is usually a set route with a certain number of other people on the same itinerary. (wikiaustralia.com)
Reynolds played a central role in organising the group of 34 artists and architects who signed a petition to found a Royal Academy of Arts, which was to hold annual exhibitions of living artists» work (now known as the Summer Exhibition) and establish a free art school. (royalacademy.org.uk)
By far the biggest attraction for organising the group trips, apart from diving Bali and seeing Sunfish (Mola Mola), is the financial benefits that the group receives. (balisunfish.com)