Usually the events are nowhere near full, specially during qualifying. As the tournaments start to wind down and in the evenings after work they can start to fill up.
This weekend could get busy with this being a weekend and finishing days of the event. Probably don't need to go super early unless you are trying to follow a super popular player (Belmo, PDW, etc.).
My experience is based off of attending events in Indiana, Ohio, Michigan, Nebraska, and Washington.
Good luck!!