You might not know, but one of the things Montana is famous for is its Rocky Mountain Oyster Festival, better known as Testy Festy, which this year will be celebrated from 30 July until 3 August.

Contrary to what the name suggests, the festival is "neither about balls or breast," but "it's about having a good time," the event organisers explained.

According to, between 300 and 3,000 people reunite every year in Clinton, Missoula County, to spend time together and have fun.

Here is what you need to know about the festival, which has been celebrated for 32 years.

Testy Festy offers several contests, including:

Undie 500: Men and women race tricycles in their underwear
Tattoo: Crowd decides who has the best tattoo(s)
Nicest Arms: Crowd decides who has the nicest arms
The Ball Eating Contest: Participants have to eat as many bull testicles as possible in four minutes.

According to Legends of America, this festival is the largest of its kind in the world. The event – where only people above the age of 20 are allowed – is renowned for the presence of half-naked party-goers who drink and celebrate for days.

Dubbed as Montana Tendergroin, or Rocky Mountain Oyster, the bull testicles cooked at the festival are approved by the US Department of Agriculture (USDA).

A Testy Festy shop offers gadgets including T-shirts, hats and Testy Festy Hot Sauce. People can purchase the items at the event, and also online.

For more information about the festival, visit the Testy Festy official wesbite.