SAN FRANCISCO (KRON) – San Francisco is gearing up for big crowds on Hippie Hill at Golden Gate Park for the annual 420 festival. 

Organizers are expecting at least 20,000 people at the free event this Saturday.

The city will have double the amount of porta potties, 30% more security, and four ambulances to help deal with the larger crowds. 

Last year, more than half a dozen people had to be hospitalized after consuming edibles possibly laced with fentanyl. 

Officials are warning people to not buy marijuana from unpermitted vendors — instead anyone over 21 years old should buy cannabis from a recreational marijuana dispensary. 

Alcohol is not allowed inside the event. 

Also, no people under the age of 18 or pets. 

And no glass — that pertains to bongs as well as bottles. 

>>Click here for a full list of restricted items

The following road closures will be in effect: 

Golden Gate Park

  • 9th Avenue at MLK Jr. Drive
  • Nancy Pelosi Drive at MLK Jr. Drive
  • John F. Kennedy Jr. Drive at Tea Garden Way 
  • John F. Kennedy Jr. Drive at 8th Ave. 
  • MLK Jr. Drive at Kezar Dr.
  • 7th and Lincoln Way
  • Fulton Street and Arguello Blvd. 

Robin Williams Meadow Area 

  • WB Fell at Shrader Street
  • NB Stanvan at Fell Street
  • WB John F. Kennedy Drive from Stanyan Street
  • EB Lincoln Way at Kezar Drive
  • WB Frederick Street at Kezar Drive / Lincoln Way
  • NB Stanyan Street at Frederick Street

Haight Street Area Closures

  • Frederick Street at Shrader Street
  • Frederick Street at Cole Street
  • Frederick Street at Belvedere Street
  • Frederick Street at Clayton Street
  • Frederick Street at Ashbury Street
  • Frederick Street at Downey Street
  • Frederick Street at Delmart Street
  • Masonic Avenue at Waller Street
  • Masonic Avenue at Haight Street
  • Masonic Avenue at Page Street
  • Oak Street at Shrader Street
  • Oak Street at Cole Street
  • Oak Street at Clayton Street
  • Oak Street at Ashbury Street

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