DENVER, CO - JANUARY 30: In this aerial view from a drone, cars begin to line up for a mass COVID-19 vaccination event on January 30, 2021 in Denver, Colorado. UCHealth, Colorado's largest healthcare provider, plans to vaccinate 10,000 seniors over 70 during the drive-up event this weekend. (Photo by Michael Ciaglo/Getty Images)
UCHealth COVID-19 Vaccination Event
In this aerial view from a drone, cars begin to line up for a mass COVID-19 vaccination event on January 30, 2021 in Denver, Colorado. UCHealth, Colorado's largest healthcare provider, plans to vaccinate 10,000 seniors over 70 during the drive-up event this weekend. (Photo by Michael Ciaglo/Getty Images)
UCHealth COVID-19 Vaccination Event
DENVER, CO - JANUARY 30: In this aerial view from a drone, cars line up for a mass COVID-19 vaccination event on January 30, 2021 in Denver, Colorado. UCHealth, Colorado's largest healthcare provider, plans to vaccinate 10,000 seniors over 70 during the drive-up event this weekend. (Photo by Michael Ciaglo/Getty Images)
UCHealth COVID-19 Vaccination Event
DENVER, CO - JANUARY 30: Signs direct people to a mass COVID-19 vaccination event on January 30, 2021 in Denver, Colorado. UCHealth, Colorado's largest healthcare provider, plans to vaccinate 10,000 seniors over 70 during the drive-up event this weekend. (Photo by Michael Ciaglo/Getty Images)
UCHealth COVID-19 Vaccination Event
DENVER, CO - JANUARY 30: A police officer directs traffic outside a mass COVID-19 vaccination event on January 30, 2021 in Denver, Colorado. UCHealth, Colorado's largest healthcare provider, plans to vaccinate 10,000 seniors over 70 during the drive-up event this weekend. (Photo by Michael Ciaglo/Getty Images)
UCHealth COVID-19 Vaccination Event
DENVER, CO - JANUARY 30: Coors Field stadium manager Ian Dyer directs traffic outside a mass COVID-19 vaccination event on January 30, 2021 in Denver, Colorado. UCHealth, Colorado's largest healthcare provider, plans to vaccinate 10,000 seniors over 70 during the drive-up event this weekend. (Photo by Michael Ciaglo/Getty Images)
UCHealth COVID-19 Vaccination Event
People arrive for COVID-19 vaccinations at a drive-thru setup at Coors Field on January 30, 2021, in Denver. (credit:CHET STRANGE/AFP via Getty Images)
UCHealth COVID-19 Vaccination Event
People arrive for Covid-19 vaccination at a drive through setup at Coors Field baseball stadium on January 30, 2021, in Denver, Colorado. - UCHealth, the organizer and Colorado's largest healthcare provider, has set the goal of vaccinating 10,000 people over the weekend. (Photo: CHET STRANGE/AFP via Getty Images)
UCHealth COVID-19 Vaccination Event
DENVER, CO - JANUARY 30: A police officer moves cones to direct traffic outside a mass COVID-19 vaccination event on January 30, 2021 in Denver, Colorado. UCHealth, Colorado's largest healthcare provider, plans to vaccinate 10,000 seniors over 70 during the drive-up event this weekend. (Photo by Michael Ciaglo/Getty Images)
UCHealth COVID-19 Vaccination Event
Gov. Jared Polis talks with Coloradans in line to be inoculated with a COVID-19 vaccine on Saturday in Denver. (credit: Jared Polis)
UCHealth COVID-19 Vaccination Event
Gov. Jared Polis views a COVID-19 vaccination event on Saturday in Denver. (credit: Jared Polis)
UCHealth COVID-19 Vaccination Event
Gov. Jared Polis talks with health care workers and Dinger at a COVID-19 vaccine event on Saturday in Denver. (credit: Jared Polis)
UCHealth COVID-19 Vaccination Event
(credit: Jared Polis)
UCHealth COVID-19 Vaccination Event
DENVER, CO - JANUARY 30: Pharmacy technicians prepare doses of the Pfizer-BioNTech vaccine at a mass COVID-19 vaccination event on January 30, 2021 in Denver, Colorado. UCHealth, Colorado's largest healthcare provider, plans to vaccinate 10,000 seniors over 70 during the drive-up event this weekend. (Photo by Michael Ciaglo/Getty Images)
UCHealth COVID-19 Vaccination Event
DENVER, CO - JANUARY 30: Ambika Nansell receives a dose of the Pfizer-BioNTech vaccine at a mass COVID-19 vaccination event on January 30, 2021 in Denver, Colorado. UCHealth, Colorado's largest healthcare provider, plans to vaccinate 10,000 seniors over 70 during the drive-up event this weekend. (Photo by Michael Ciaglo/Getty Images)
UCHealth COVID-19 Vaccination Event
Fred Paskins receives a dose of the Pfizer-BioNTech vaccine at a mass COVID-19 vaccination event on January 30, 2021 in Denver, Colorado. UCHealth, Colorado's largest healthcare provider, plans to vaccinate 10,000 seniors over 70 during the drive-up event this weekend. (Photo by Michael Ciaglo/Getty Images)
UCHealth COVID-19 Vaccination Event
UCHealth registered nurse Karen Nerger administers a dose of the Pfizer-BioNTech vaccine at a mass COVID-19 vaccination event on January 30, 2021 in Denver, Colorado. UCHealth, Colorado's largest healthcare provider, plans to vaccinate 10,000 seniors over 70 during the drive-up event this weekend. (Photo by Michael Ciaglo/Getty Images)
UCHealth COVID-19 Vaccination Event
DENVER, CO - JANUARY 30: Colorado Governor Jared Polis (L) speaks with UCHealth chief innovation officer Richard Zane (C) and UCHealth chief marketing officer Manny Rodriguez (R) as he visits a mass COVID-19 vaccination event on January 30, 2021 in Denver, Colorado. UCHealth, Colorado's largest healthcare provider, plans to vaccinate 10,000 seniors over 70 during the drive-up event this weekend. (Photo by Michael Ciaglo/Getty Images)
UCHealth COVID-19 Vaccination Event
Pharmacy technician Chasity Montoya (L) prepares doses of the Pfizer-BioNTech vaccine at a mass COVID-19 vaccination event on January 30, 2021 in Denver, Colorado. UCHealth, Colorado's largest healthcare provider, plans to vaccinate 10,000 seniors over 70 during the drive-up event this weekend. (Photo by Michael Ciaglo/Getty Images)