1) Can I bring my better half/non-member/brother/sister/family?
Yes you can
2) Entrance fee?
None really since you'll buy your own food and drink. But there will be a registration area where you need to put your name and handle, then (at your discretion) buy raffle tickets (as many as you want) where you might win a raffle prize.
If you have a car, come early...it's a Friday so expect heavy traffic and parking. If you have a bike (like me), there's always a place to securely park it.