Taking it seriously??
A few years ago at my son's sports day, the head teacher (also a parent) and one of the other dads had a play fight on the start line which ended with both of them on the floor tangled up in their sacks.
Tha last mums race I did was a relay in house teams, points going to our childrens team position. We had to do the water filled balloon over our head then between our legs, back marker races to the front and starts again. I tucked my skirt into my knickers and erm, well, the elastic wasn't quite as strong as I would have liked. 