What is 420 Day: where did it originate?

Americans are flocking to social media or hanging out with their best "buds" in public spaces Wednesday to celebrate 420 — an unofficial holiday dedicated to celebrating and smoking marijuana.

But what is 420 Day and where did it originate?

According to National Day Calendar, 420 Day is celebrated every year on April 20,

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Where did 420 originate?

Since the 1970s, people have celebrated the unofficial holiday. But why is it celebrated on 4/20 and where did the celebration originate?

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However, most believe 420 Day originated in California

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in the 1970s when a group of teenagers from San Rafael High School in Marian County would ritualistically smoke marijuana at 4:20 each day. The number 420 became their code for marijuana.

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"Happy 420," XXL magazine posted along with a picture of actor Seth Rogen alongside rappers Snoop Dogg and Wiz Khalifa smoking marijuana "blunts."

420 events in US

After a two-year hiatus, San Francisco prepared for thousands of people to return to Golden Gate Park's Hippie Hill, for the annual 420 marijuana gathering.