The episode of King of Beasts GoLion used to create this episode of Voltron is titled "Protect the Soccer Field". In that episode the GoLion Team (Voltron Force in Voltron.) is helping to build a soccer stadium on Planet Altea (Arus in Voltron.) for the use of the citizens of Altea. There is no "Space Olympics" being held.
They keep referring to the machine that moves dirt and gravel as the "earth mover" but they are not on earth.