An Annual Gathering (abbreviated AG) is the largest event of many national Mensas. A number of countries hold AGs, with the largest ones being held by American Mensa and British Mensa. An AG is, in general, larger in scale than a Regional Gathering (RG), which is a smaller gathering drawing attendees mostly from within a region. Normally, the AG is held at a large hotel in a major city, to accomodate a sizeable attendance, and may be located in different cities every year. In some cases an official annual business meeting of the national Mensa organization is held in conjunction with the AG, and there may also be a board meeting of the national officers and directors and various committee meetings. However, social and recreational events dominate over the official business, except for a minority of members who thrive on Mensa politics.
On rare occasions a World Gathering is held, usually to commemorate a major anniversary of Mensa. This may take the place of the Annual Gathering of the country hosting it; for instance, the 2006 World Gathering will also serve as the AG of American Mensa for that year.