I've worked many trade shows over the years. You're there to sell and you need to sell to keep your business afloat, but sometimes you get those days when there's sod all happening.
You start out trying to look busy
You go through all the new stuff, prices etc with your salesforce, but eventually the whole thing just sort of winds down and in the end you're all sitting there bored out your brains.
At this point some inconsiderate would be customer rocks up. And it becomes a real struggle to get enthusiastic. You kind of wish they'd shove off
I think I know how those guys felt. You just get days like that