PHOTOS: Thousands gather for 4/20 celebration at Golden Gate Park in San Francisco

SAN FRANCISCO, California -- Thousands are gathering in Golden Gate Park to light up in honor of 4/20. Officials say this year's festivities will be more controlled and less chaotic.

BACK TO THE BEGINNING: How April 20 became a pot day

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At 4:20 p.m. today pot smokers will celebrate this unofficial holiday.

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