and the Judges' Oath is taken by the chairman of the Tournament Judges' Commission. Parading of flags, speeches and official opening also make up the required parts of the ceremony. There is also often a musical and artistic aspect of the ceremony. For example, more than 400 artists took part in the opening ceremony of the 2017 World Games in Wroclaw. Athlete party Since 1993 at The Hague, an athlete party has been held in the middle of the competition, and a similar event is planned for Birmingham 2022. It was intended to allow all athletes to participate in at least one ceremony (opening, athlete party, or closing) during the competition. Closing ceremony The closing ceremony ends The World Games and follows the last awards ceremony. Official aspects include speeches, a presentation by the next host city and a handing of the flag of the Games to the representatives of the next host city. In Wroclaw, the second part of the ceremony was a concert performed by local artists. Editions Sports Official sports For The World Games in 2017 and before, official sports were selected solely by the IWGA. Only sports whose international federations were members of the IWGA could be selected. From 2022, the official sports are selected by both the IWGA and host city and can include some sports whose federations are not part of the IWGA. As formalised in the memorandum of understanding, "only events that are not on the programme of the Olympic Games can be included in the programme of The World Games". For example, canoe polo is a discipline at The World Games, while canoe sprint and canoe slalom are disciplines at the Olympic Games, despite all three being governed by the International Canoe Federation. Sports which have been contested at all editions of The World Games are bowling, finswimming, trampoline and tumbling disciplines of gymnastics, karate, powerlifting, roller sports, tug of war and water skiing. Invitational sports In addition to the official sports, the host city, in coordination with the IWGA, has been allowed to invite sports to participate in the individual programme. Therefore, these sports can be those whose international federations are not part of the IWGA. For example, the Birmingham Organising Committee have selected men's lacrosse (women's being selected by the IWGA), duathlon, flag football, wushu, and wheelchair rugby. Some sports or disciplines started in The World Games as invitational sports