Here’s a tip for Sarah Jessica Parker: Don’t blacklist the people you think you’re helping.

As The Post’s Lisa Fickenscher reported, the “Sex and the City” star just held a fund-raiser for a group pushing a massive minimum-wage hike for New York restaurant staff — with details kept secret to keep protesters away

Who’d want to protest? The many wait-staff who prefer the current “tipped minimum wage” system and fear the change would reduce their income and kill jobs.

Who’s actually behind the drive? The forces out to unionize the restaurant industry, because the tipping system makes it too hard to collect dues.

So organizers kept the location a secret, given out only to those who bought tickets (tables went for up to $50,000) and passed a background check.

“I’ve been contacted by dozens of servers who were interested in protesting,” Joshua Chaisson told The Post. The Maine bartender, who represents the pro-tipping Restaurant Workers of America, went on: “They were particularly furious about a $50,000-per-table fundraiser to harm our industry, attended by people who don’t work in our industry.”

But how else can rich celebs decide what’s best for the little people?