From NBC12 news:

Another anti-gun violence school walkout is planned for Friday, and this one will include a rally at the Virginia State Capitol.

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The protest will begin at 10 a.m. with a school walkout to honor the Columbine victims. Then starting at noon a march will take place from Brown’s Island to the Capitol.

Police are expecting a crowd of about 10,000 people to participate, and are asking people who are normally in that area during the day to be patient and plan ahead due to the rally.