Sea Otter Registration Question

I am signed up for one of the mid-day Saturday road races at Sea Otter. I have not been down there at all yet. I am planning to drive down tomorrow morning. From the race website I see this:

Wednesday 12 noon to 6 pm.
Thursday and Friday 6 am to 6 pm.
NO SAME-DAY REGISTRATION. YOU MUST REGISTER THE DAY PRIOR TO YOUR RACE DAY.
Pre-Registered athletes can pick-up numbers up to 1 hour before your race start time

What does this mean exactly? Did I have to do some sort of other event registration on Wed.-Fri. in order to race on Saturday? Or can I just pick up my number Saturday morning since I signed up online for my race a few weeks ago?

Thanks!

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