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I am not certain but remember reading or hearing about pre-clearance prior to the arrival of a location. USSS will come in and clear anyone not known to be uber safe. Most likely the eatery is given a 20-30 minutes out warning to clear all patrons except those deemed "safe" and/or "photo-op worthy". You can rest assured no one with a firearm was allowed to be in the building during the visit. This would be the same for any President, not just the current.

Rpenn57 wrote:I'm sure some of the rules are "legally" unenforceable. But based on previous year's SXSW, one should be more aware of dangerous cars than not being able to carry.

Beat me to it