Watch: Boston runners strip down for Cupid’s Undie Run

Several hundred participants ran in the annual Cupid's Undie Run to raise money for the Children's Tumor Foundation in 2017. —John Tlumacki / The Boston Globe

For an essential guide to the city, sign up for How to BostonBoston.com’s weekly culture and lifestyle newsletter.

Watch participants take part in Cupid’s Undie Run below:

Here’s one way to celebrate Valentine’s Day this weekend: You can run around Fenway in your underwear. For a good cause, of course.

Cupid’s Undie Run, billed as “the nation’s largest pantless party,” will take place Saturday, Feb. 17 from noon to 4 p.m. Part of a nationwide campaign by Cupid Charities, the run takes place in 30 cities during the month of February and raises money for the Children’s Tumor Foundation and neurofibromatosis research. Neurofibromatosis is a genetic disorder that causes tumors to grow on nerve tissue. Cupid’s Undie Run events have raised more than $14.5 million since 2010, according to the event website.

Advertisement

“We run in our undies because those affected with NF can’t cover up their tumors,” the run’s website reads. “They can’t put on clothes to feel more comfortable, so why should we?”

Participants running in the Cupid’s Undie Run in Boston in 2017. —John Tlumacki / The Boston Globe

That said, organizers say undies aren’t mandatory and (PG-13) costumes are welcome.

Participants who register online can party at the House of Blues before taking off for a “mile(ish)” and “brief” (get it?) 15-minute run, then return to HOB for a post-race party. For those who want to keep the party going, an official after-party will take place at 4 p.m. at the Lansdowne Pub.

According to the event’s Facebook page, nearly 200 people are attending this year in Boston and more than 500 people are interested. Organizers expect about 14,000 people to participate in runs nationwide, per the event’s website.

Those who wish to donate without running can do so on the website.