The egg-cracking contest, that is, each contestant had to crack his egg against competitors'. The winner takes the broken egg and goes on to challenge other winners until there is just one left over.

碰鸡蛋比赛中，参赛者将鸡蛋与对手的相碰，胜利方带走碰破的鸡蛋，接着挑战其他胜利者，直到冠军产生。

youdao

The festival's four egg contests include a five-minute hardboiled-egg eating contest, usually winnable with 25, and egg roulette, where contestants smash one of six eggs against their face.

WSJ: Big Chocolate Eggs May Be Big, but Big Hen's Eggs Not So Much