Hundreds of marijuana reform advocates are expected to rally outside the White House on Saturday in a demonstration ending around 4:20 p.m. with what may be one of the largest pot-smoking acts of civil disobedience to occur in the nation’s capital in recent years.

Organizers are protesting what they view as unacceptable inaction by President Barack Obama on cannabis reform, and the event – if all goes according to plan – will be captivating for die-hard reformers and passing tourists alike.

Advocates will march onto the pedestrian-only section of Pennsylvania Avenue in front of the White House around 2 p.m carrying a massive 51-foot plastic “joint” that says "Obama: Reschedule Cannabis Now."

DJ Big Will then will play music with a car battery-supported sound system as national news crews cover talks from medical marijuana patients and a “blessing” from a cannabis-praising religious group.

Attendees will get an inside scoop on plans for an upcoming marijuana seed giveaway and for a veteran-led marijuana edible giveaway later this month.

Protest organizers are drumming up enthusiasm by towing an activist-filled metal cage to nearby college campuses on Friday. The activists are distributing leaflets prepared by the D.C. Cannabis Campaign, whose coordinator Adam Eidinger called the protest last month.

The cage, featuring a cot and toilet, will be parked near the White House during the protest.

It’s unclear if enthusiastic attendees will bring enough marijuana to share with empty-handed participants, and announcing such intentions could invite serious criminal charges.

It’s also unclear if law enforcement officers intend to arrest people who commit acts of civil disobedience. In case they do, organizers intend to make it clear who is – and who is not – thumbing their noses at the law.

About 400 people have indicated on Facebook they will attend, but a video posted Friday to the social network rapidly soared past 150,000 views, which Eidinger says may – along with press coverage – make attendance swell, with a large group intending to consume cannabis regardless of turnout.

“There’s a core group of us that, come hell or high water, are using it, and we’re all psychologically prepared to be in jail until Monday,” Eidinger says. “We’re talking dozens of people.”

An advisory distributed to would-be attendees on Friday urges people to be polite to passersby and police officers and recommends that anyone risking arrest not struggle while being detained.

Some marijuana reform advocates oppose plans to smoke at the White House, and the event lacks the backing of large national groups that have spearheaded state-level reforms. Pro-reform members of Congress have indicated they won't attend.

But that may do little to dampen the event. The D.C. Cannabis Campaign has repeatedly shown its organizational prowess, going it alone to legalize marijuana through a local ballot initiative that won 70 percent voter approval and then – in response to a congressional budget rider banning the city government from regulating recreational pot sales – organizing two massive marijuana seed giveaways.

"We're frustrated by national groups that haven't called for any protests at the White House for years," Eidinger says. "What we're doing is forcing this thing into the open. ... The president plans to live here after the White House – we’re going to remind him of what he didn’t do for us when he could have."

The protest demands that Obama use his authority to administratively reschedule marijuana and issue mass pardons for marijuana convicts. Marijuana currently is a Schedule I substance, a federal definition for abusable drugs with no accepted medical value, making lawful research difficult and prescription illegal.

Twenty-three states and the nation’s capital currently allow sales of medical marijuana, while four states have laws allowing the sale of marijuana for recreational use. Voters in the nation’s capital in 2014 made personal possession of marijuana legal locally – though possession remains illegal on federal land.

"We need more pressure on the Obama administration – he’s overseen 5 million arrests, he hasn’t really had an agenda, he’s never introduced a reform bill. This is his last chance, and I’m surprised my phone isn’t ringing from the White House today, saying 'We'll meet with you guys,'" Eidiger says. He had offered to call off the event in exchange for a meeting.

Eidinger says he’s helped organize about 50 protests at the White House for various causes and that he expects police to allow the intentionally permit-less event. Authorities would need to shut down the section of Pennsylvania Avenue to all pedestrians in order to bar the gathering, he says – and in the unlikely event that happens, the protest will simply reconvene nearby.

Law enforcement entities that patrol the area have not publicly said what they intend to do. Eidinger says he hasn’t heard from officials but plans to make clear to them Saturday that he’s in charge and that everyone won’t be breaking the law.