More than 6.4 million people are participating in more than 21,000 events this week as part of National School Choice Week. Organizers say it's the "largest series of education-related events" in the country's history.
National School Choice Week started in 2011 with just 150 events across the country. By 2013, it had ballooned to more than 3,600 events. The celebration of educational choice has included more events every year it's been held.