and what's the age requirement? still at least 18?

I have never been to one of these events before. Do you need a helmet to participate?

Thanks everyone for the replies. I'm thinking about doing both days now.
What times do these days start and end? I can't seem to find detail listing any where. Are they 9 to 5?
Is there a link I...

Can someone give my a brief outline of the schedule?
I'm trying to decide between doing the one day vs two days but can't see what each day covers.
Thanks.