Probably that if you show any weakness - anything from physical discomfort, being sick, not being 100% mentally, the customer may end up losing confidence in you. It's better come to delay and come back fully prepared.
I like to use the plumber model to describe this. When you have a major problem in your house you hire a plumber. He or she will show up as necessary to fix the problem, probably every day, but what about when that part needs to come in. They are going to come to your house, pull out a laptop and sit at your table while they talk to other suppliers about other jobs and direct their workers at other sites? No, they are going to give you a summary and head off to make money somewhere else.
Now if you don’t have anything else to do, sure go in and network.. find leads. But if your contract is 6 months and you’re just extra hands on site... go try to make more money!
