Saturday, thousands of people descended on downtown Denver to voice their opposition to the Trump administration and its policies.

Protesters gathered nationwide, including Colorado, as President Trump attended a parade commemorating the Army's 250th anniversary on his 79th birthday.

Organizers of the “No Kings” demonstrations said millions had marched in hundreds of events. Governors across the U.S. had urged calm and vowed no tolerance for violence, while some mobilized the National Guard ahead of marchers gathering. ‘We’re all people’: Chicago ‘No Kings’ demonstration sees giant crowd march peacefully around Loop

The organizer of one of the rallies in Douglas County expected 1,000 people to attend, but it appeared they may have surpassed that number.

Dozens of Regional Transportation District routes were detoured or delayed throughout metro Denver on Saturday as thousands of Coloradans gathered for “No Kings” protests.

As one of the largest demonstrations of the year prepares to take shape on the steps of the Colorado State Capitol, Denver police are taking to social media to outline what participants can expect. Hanna Powers spoke with an expert on how they plan to keep the day safe.

The organization is made up of EMTs, nurses, and paramedics who will be at the protest, ready to respond to medical emergencies ranging from dehydration and heat stroke to injuries caused by potential police force.

Here's the full list of No Kings Day protests on June 14 across key cities, including Las Vegas, New York, and Houston..