Members of MoveOn, a group of advocates for progressive change, will participate in the first National Pink Out Day on Tuesday, according to a news release.

Donning pink attire, group members and interested people and families will gather from 11:45 a.m. to 12:45 p.m. Tuesday in South Park to show support for Planned Parenthood.

According to the release, more than 230 events scheduled nationwide for Tuesday, including rallies, “sex-ed teach-ins” and free STD testing, aim to demonstrate “the essential role Planned Parenthood plays in the country.”

Republicans across the U.S. have been calling for eliminating federal funding to Planned Parenthood, and some in Congress have threatened to shut down the government over the issue. The demands became especially heated after the disclosure this summer of videos that purported to show Planned Parenthood employees discussing the use of aborted fetuses in research.

“These continued attacks by extremist politicians on women’s health are part of a dangerous agenda to roll back access to reproductive health care and ban abortion,” Teresa Dixon, MoveOn member, said in the release. “We’re lifting up our voices and their stories to let Congress know that we stand with Planned Parenthood.”