Tour of Lawrence

Okay, its not set in stone, but thinking of getting my roadie on.. Tour of Lawrence is this weekend and I am thinking of doing the circuit race on Sat..

Saturday
June 30

Event Type	Time	Location	Event
Race	8:30am	KU Campus	Master's 40+/50+/60+ KU Circuit Race
Race	10am	KU Campus	Cat 5 KU Circuit Race
Race	11am	KU Campus	Cat 4/5 KU Circuit Race
Race	12noon	KU Campus	Women 3/4 Juniors 14-18 Juniors 10-13 KU Circuit Race
Race	1pm	KU Campus	Cat 4 KU Circuit Race
Race	2:30pm	KU Campus	Cat 3 KU Circuit Race
Race	4pm	KU Campus	Women Pro/1/2 KU Circuit Race
Race	5:30pm	KU Campus	Pro/1/2 KU Circuit Race

So I need some help from my CX/Roadie friends. Do I have to start at Cat 5? Do I do that race or the 4/5's? I just know you guys are a peculiar bunch, love your rules and shaved legs carbon parts and all...
Just need the 411 on everything..