Vaccine appointments in New York City will be rescheduled due to a major winter storm heading toward the East Coast.

The nor'easter is expected to begin Sunday night and could dump up to a foot of snow onto the city.

"Last thing we want to do is to urge our seniors to come out in the middle of a storm like this," NYC Mayor Bill de Blasio said at a press conference Sunday morning. "It doesn't make sense."

-ABC News' Joshua Hoyos

The mass COVID-19 vaccination site at Dodger Stadium, one of the largest in the country, was temporarily halted Saturday after the entrance was blocked by anti-vaccine protesters.

The group carried anti-vaccine and anti-mask signs, leading to a long line of cars waiting to get into the stadium, ABC Los Angeles station KABC reported.

The stadium entrance was closed from about 1:50 p.m. to 2:45 p.m., Los Angeles Fire Department Public Information Officer David Ortiz told ABC News. Vaccinations continued inside as the gate was closed, Ortiz said.

A social media post described the demonstration as "SCAMDEMIC PROTEST/MARCH" and advised participants to refrain from wearing pro-Trump or MAGA attire.

"…we want our statement to resonate with the sheeple," the post read, according to The Associated Press. “No flags but informational signs only.”

No arrests were made as a result of the protests.

Republican Arkansas Gov. Asa Hutchinson said Sunday that vaccine distribution has been "seamless" under the Biden administration.

"In terms of the vaccine distribution, it's been seamless. And I was delighted that we had a ... 14% increase in vaccine supply last week. This is going to be very, very important for us. They said they're going to invoke the Defense Production Act. I don't know the details on that, but anything they can do to speed up the production," Hutchinson said on ABC's "This Week."

"Thank goodness we have that partnership which is good with the federal government. And President Biden and his team is -- is working to assure that partnership and not tear it apart, which I'm very grateful for," he told "This Week" Co-anchor Martha Raddatz.

-ABC News' Jack Arnholz

Dave McGillivray, the race director of the Boston Marathon, has been selected by the state of Massachusetts to run the mass vaccination operations at Gillette Stadium and Fenway Park.

McGillivray owns DMSE Sports, which organizes and manages dozens of outdoor events every year. To help keep DMSE Sports afloat, McGillivray connected with CIC Health -- which operates the mass COVID-19 vaccination sites at Fenway Park and Gillette Stadium -- through the state of Massachusetts.

Now, McGillivray is running logistics for both sites.

"For me, the feeling is so good that the thing that knocked us to our knees is now the thing that is allowing us to do good: that we're keeping people healthy, we're saving lives and we're even bringing our own industry back," McGillivray said in an interview with Boston ABC affiliate WCVB().

Fenway Park is the home of the Boston Red Sox, while Gillette Stadium, located in Foxborough, is the home stadium for the New England Patriots. The Gillette Stadium site opened two weeks ago, with Fenway officially opening Monday. Both sites are expected to administer 5,000 doses per day once fully up and running.

The Boston Marathon, usually held in April, has been postponed to October. The in-person event was canceled in 2020, though it was held virtually.

ABC News' Arielle Mitropoulos contributed to this report.

There were 164,665 new cases of COVID-19 confirmed in the United States on Thursday, according to a real-time count kept by Johns Hopkins University.

Thursday's case count is far less than the country's all-time high of 300,282 newly confirmed infections on Jan. 2, Johns Hopkins data shows.

An additional 3,872 fatalities from COVID-19 were registered nationwide on Thursday, down from a peak of 4,466 new deaths on Jan. 12, according to Johns Hopkins data.

COVID-19 data may be skewed due to possible lags in reporting over the Martin Luther King Jr. Day holiday weekend.

A total of 25,766,735 people in the U.S. have been diagnosed with COVID-19 since the pandemic began, and at least 433,195 have died, according to Johns Hopkins data. The cases include people from all 50 U.S. states, Washington, D.C., and other U.S. territories as well as repatriated citizens.

Much of the country was under lockdown by the end of March as the first wave of pandemic hit. By May 20, all U.S. states had begun lifting stay-at-home orders and other restrictions put in place to curb the spread of the novel coronavirus. The day-to-day increase in the country's cases then hovered around 20,000 for a couple of weeks before shooting back up over the summer.

The numbers lingered around 40,000 to 50,000 from mid-August through early October before surging again to record levels, crossing 100,000 for the first time on Nov. 4, then reaching 200,000 on Nov. 27 before topping 300,000 on Jan. 2.

So far, the U.S. Food and Drug Administration has authorized two COVID-19 vaccines for emergency use -- one developed by U.S. pharmaceutical giant Pfizer and its German partner BioNTech, and another developed by American biotechnology company Moderna and the National Institute of Allergy and Infectious Diseases. More than 24 million vaccine doses have been administered nationwide, according to the latest data from the Centers for Disease Control and Prevention.