You plan your event with one person: me. One phone number, one voice, one person accountable from first call through load-out.
When the show needs more hands I bring in my crew, and here is the part planners notice on show day: every person on it runs their own production company. I don't hire day labor. Drive and judgment are things you can't teach somebody by Friday, so I pay more for people who own their work.
Owners show up early, catch problems before you see them, and treat your show like their name is on it, because around here it is. You get the coordination of a one-man shop and the muscle of five companies, without a production company's overhead.