Olympic Congresses are gatherings of all the various bodies and individuals involved in the Olympic Movement. The Olympic Charter now states that they are to be held, in principle, every eight years at a place and date determined by the International Olympic Committee (IOC). It should be noted that this has not always been the case. Baron Pierre de Coubertin intended Olympic Congresses to be held from “time-to-time” to discuss the Olympic Movement. However, a gap of 43 years occurred from the 9th Olympic Congress until the 10th Olympic Congress in 1973. The Olympic Congress has no official power to make rules concerning the Olympic Games or to modify the Olympic Charter but only acts as a consultant to the Olympic Movement.
See here for a list of Olympic congresses.