Five events: 100m dash, long jump, shotput, hurdles and high jump. Each participant has to wear electric dog collars around their various bodily parts, ranging from neck to wrists, ankles and potentially genitalia (for a special elimination round in case of ties or boredom).
Build wooden horses for the boys to joust on. The horses are built from the shoulder up so they can be ridden low rider style, (and a fall won't totally take out a cast member. But if you feel like making scale wooden horses, be my guest.). The horses must have some sort of hard to control motivator on them, like a sheet of thick ice, casters, or I suppose regular skate board wheels would work. (but skateboard wheels would offer maybe a bit more control than I had imagined).