What is "decastar"

Décastar (stylised DECASTAR) is an annual athletics competition that takes place in Talence, in the department of the Gironde in France. Organised by the International Association of Athletics Federations (IAAF), it is one of the athletics meetings that make up the IAAF World Combined Events Challenge. Male and female athletes compete in the decathlon or heptathlon, respectively, and points scored at the Décastar count towards a yearly total for the parent competition.