The Auspicious Contest

I need some information on this event, did it 2x in a row, and i couldnt dig the chest second time tou i was second on the event, had the chest on my name, but still couldnt dig one, so, is it like you can do this event once a day? or you need something else to do to dig if you have the chest on your name? back when the event started i did it for the tittle, after 4 sons i couldnt dig the 5th one till i accepted the title chelenge, then i could get the 5th one, but i do have the tittle so supose i cannot get it again, till i have it, is that have something to do that i cannot dig chests 2 times in a row?(and i mean 2 times in row like one event after another, not on same event)