Running a 12K! How should I prepare?

I'm going to be participating in a run in San Francisco called Zazzle Bay to Breakers on May 20th that's 12K. This will be the first time for me being in ANY kind of running event, so I have no idea how to go about preparing for it and I was wondering if anyone had advice as to how I should train/diet/anything. Any guidance would be extremely helpful! :happy:

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