She expects 1,000 or more women - and men - to take part, since that's how many said yes via Facebook to attending in June. That date, though, was postponed for lack of the proper permits, which just came through.
More than 1,700 people have "liked" the SlutWalk Philadelphia's Facebook page so far.
Thousands took part in the first Slutwalk, held in Toronto in April, after a police officer there said, "Women should avoid dressing like sluts in order not to be victimized."
Organizers deliberately used the word slut, declaring, in a manifesto, "We are tired of being oppressed by slut-shaming; of being judged by our sexuality and feeling unsafe as a result."
That remark apparently tapped a reservoir of outrage, because similar marches were being held across the United States and Canada, and even overseas.
"It's a dress, not a yes," read a sign in London. "This is not my 'I want you' face!" was a message in Chicago. "It's my hot body, I do what I want" was printed out in Boston. "Rape is never OK," said a sign in Seattle.
"In just a few months, SlutWalks have become the most successful feminist action of the past 20 years," blogger Jessica Valenti wrote for the Washington Post.
Local outrage also erupted, Altman said, when editor Dan Rottenberg wrote at his Broad Street Review website how women "need to take sensible precautions before they're victimized" and questioned the wisdom of cleavage-revealing publicity photos for CBS correspondent Lara Logan, who was brutally gang-raped in Egypt.
Rottenberg, who wrote an apology or two, said this morning he was trying to provoke discussion, and apparently got too provocative.
But airing views is healthy, "so I think it's all to the good," he said.
"We must share our perceptions with each other openly and honestly, instead of shouting each other down."
For more on SlutWalk, go to www.philadelphiaslutwalk.com, or search for "SlutWalk Philadelphia" on Facebook.
Contact staff writer Peter Mucha at 215-854-4342 or email@example.com.