Ok, so it's not a reality yet, but female students are petitioning for a women-only version of the world famous bull run, but with cows. Reuters reports that they've created a website specifically for their campaign, where they state,
"Cows, as well as bulls, have four legs and a natural instinct to run," and "an encierro for cows, would put Pamplona at the vanguard of traditional fiestas with equality for men and women." Not sure what they're going on about in that last bit, but you'll have to make do with running with the bulls and the men for now, as the organisers did not respond to the cow-running suggestion this year. A good thing, perhaps, as being crushed to death by a cow probably isn't a good way to spend a holiday.