A preflight walkaround exists because the cheapest moment to find a problem is while the aircraft is still on the ground. Bars run on the same principle and almost never write it down. The sound gets checked, the till gets counted, the kegs get tapped, and the water systems get looked at only once something is already on the floor.
A venue's plumbing checklist is short enough to fit on one page. Ice wells should drain instead of pooling. The glass washer should reach temperature without stealing hot water from the mop sink. Beer line rinse and the keg cooler drain both want eyes on them. Every hand sink an inspector will look at should have hot water at the tap. The restroom fixtures and the drain behind the bar are the two items that decide how a busy night actually feels.
Load is what makes those items matter. A drain that moves slowly at four in the afternoon with nobody in the building is a line down the hallway during the break between sets, when the whole room queues at once. Plumbing fails at peak rather than at open, which is why fifteen minutes before doors is worth more than a nightly hope.
The bigger jobs arrive with growth. Adding a second service bar means supply, waste and vent, not just a countertop and a speed rail. Raising occupancy can raise the fixture count a room is required to provide, which turns a booking decision into a construction decision. Ice production, glass washing and a keg cooler all put demand on the same water heater, and a venue that starts doing weekend brunch discovers the ceiling on that heater in about a month. None of it is exotic work, but all of it wants a contractor who has done commercial rooms rather than a handyman with a van.
The number of a contractor who works on commercial rooms belongs on the same sheet as the fire extinguisher inspection date. A.A. Cassaro Plumbing handles commercial jobs alongside its residential work, and its service list runs from emergency calls and drain repair through tenant improvements and build-outs, which is roughly the range a venue works through over a few years. Anyone running a room of their own may find that useful to have filed before a Saturday.
Add the water items to the pre-open list this week and put the date of the last drain cleaning at the bottom of the same page, so whoever opens the room next can see how long it has been.