President Donald Trump is coming to the Bay Area on Tuesday morning, which means activists with the Backbone Campaign need to get their helium ready.

As part of a conga line of protests being organized against the president’s rare fundraising visit, cloaked in secrecy but possibly taking place in the tony Peninsula enclave of Atherton, the Backboners have raised more than $3,000 on Facebook to launch a gigantic baby-Trump-in-diapers balloon near his events in the Bay Area and, later, in San Diego.

Other anti-Trump groups are planning protests in a part of Northern California that the president considers enemy territory. But the Backbone Campaign folks are taking a decidedly saucy and irreverent approach to show their displeasure with the man in the White House.

“President Trump is coming to CA on September 17th and 18th, and we’re going to show him that he is not welcome here,” according to a Facebook fundraising page set up by the Seattle area-based group, whose self-described mission is to “amplify the aspirations of ‘We the People’ with creative strategies and artful activism to manifest a world where life, community, nature, and our obligations to future generations are honored as sacred.”

Here are some things to know about the group and its artful aspirations:

Who are they?

Created in 2003 by Seattle activist Bill Moyer, the Backbone Campaign espouses a theory and practice of “artful activism,” in which performing-arts tenets are melded with political strategies to spawn nonviolent social change. Moyer and his colleagues have created and produced hundreds of creative protests, including demonstrations that feature spotlights to project political messages onto the sides of buildings.

How did it start?

Moyer co-founded the Backbone Campaign with “friends from an artist affinity group,” according to its website. “He has dual and intersecting paths as both an activist and artist. His involvement with social change work stretches back to the 80’s, when as a student he was deeply involved in the anti-nuclear movement and the anti-interventionist movement.” Moyer has studied political science and American philosophy, worked with members of the Navajo Nation on land issues, attended the Institute for Social Ecology, and lived for while on an organic vegetable farm in Vermont.

What’s their message?

The group’s motto says it all: “When the people lead, the leaders follow.” And it says it’s working “across the country to build a broad social movement that honors life, community, nature, and our obligations to future generations as sacred.”

What’s the group’s plan during Trump’s Bay Area visit?

The Backbone Campaign says it wants to mobilize its “Baby Trump” balloon to fly during the president’s visits in both the Bay Area and San Diego. “This means we need to raise money for helium (which is the single biggest expense) and transportation costs! We are estimating to do both days this will cost us approx $4800 (which will also cover a bit of our organizational overhead costs),” the group said on a Facebook fundraising page. “All donations help! Whether it’s $1, $5, or $100, it all adds up, and help to get the Baby into the air!”

Where will they fly the Baby Trump balloon?

“We have heard that the Bay Area event will be in the town of Atherton, just slightly northwest of Menlo Park, and south of Redwood City,” the group also said on the Facebook fundraising page, even though Atherton police have said that that plan has changed and it’s unclear where the president will be Tuesday. “We do not know an exact location yet, but it is a ‘luncheon’ so it will likely happen sometime between 10am and 2pm. After this event he will be heading to Beverley Hills for dinner, and will likely spend the night in LA before heading to San Diego in the morning.

“We have little information about the San Diego event,” the group aid, “but news media seems to think that there will be some kind of public event apart from the fundraiser, possibly related to the Border Patrol or the Wall. If he plans to go to the Border or meet with Border Patrol, then we will fly baby Trump down there. If he goes to visit a military base, then we will plan to fly it outside the base.”

How much money have they raised so far for the balloon?

As of Monday morning, the group has raised $3,842 from 163 people in 14 days — enough, they say, for the helium they need to send the balloon skyward.

What is their goal?

Since the Backbone Campaign is a 501(c)(3) organization, they say they “cannot engage in partisan politics, or support or endorse any candidate or party. This also means we cannot directly interfere with candidates or parties that are raising money, as this will threaten our tax-exempt status. So, as a non-profit, non-partisan organization we want to make it clear that Backbone is not, and cannot, protest the RNC and the Trump Campaign.”

The group said on the Facebook fundraising page that it plans “to have the Baby set up close by, but not directly in front of the fundraiser entrance (but there is nothing stopping any individual from moving closer to the fundraiser). If Trump’s only appearance in San Diego is at the RNC fundraiser then the Baby, like the Bay Area event, will need to remain a block or two away from the fundraiser entrance to not give the appearance of directly protesting the RNC.”

What are some of the props they use to beef up their protests?

The group’s website includes these protest props: “Guerrilla Light Projection, Overpass Light Brigade LED Panels, Giant Overpass Banners, Giant 2D & 3D Imagery, Papier-mache Puppets, Helium-assisted Banner Lifts.”

So what exactly is the point of the Baby Trump balloon?