What separates this from a generic beer tent: the setting is actually the Presidio, meaning you're drinking within view of the bay and the bridge rather than a parking lot. Parks4All runs the event as a fundraiser for park programming, so the crowd tends to skew toward people who actually like the park, not just the pour. Expect local and regional breweries, food options on-site, and the general chaos of a grassy outdoor festival when the fog holds off.
Practical notes: Muni's 43 and 45 lines get you to the Presidio's main post without parking drama. If you drive, the lot off Lincoln fills fast — arrive early or use the Presidio's eastern lots and walk in. No BART stop is close; plan a connection from Civic Center or Montgomery. Bring a layer regardless of the forecast.
If you've got two hours: skip the first hour of the main pour when lines are longest. Hit the mid-afternoon session, work the smaller brewery booths first, and spend your remaining time near the overlook before the fog makes the view a memory.