I'm pretty sure they are unavailable now, besides outside markets (and inflated costs). Tickets went to STHs first, and then at 6pm they opened up ticket availability to VIP enews subscribers with a password. And then, if any were left 8pm to general public. By all means, don't stop trying until it's confirmed, but it seems like all have been given out already.
All the usual parking areas should be open. I typically use the one across from the convention center because it's an easy out after and like half the price. I'd say get there early because there will be crowds and a huge line, but from what I remember from 2012 they kept us in line for awhile then let everyone in 30 minutes before the rally or so.
I wasn't able to get tickets this year. I was traveling today and in the midst of the recovery from late night celebration (with some day after celebrations mixed in as well) I hadn't checked my email and found the details too late. I had a blast at the last rally, enough fun to feel okay about being outside this year. Plus it feels good to know/hope my missed tickets will go to other fans who weren't fortunate enough to get in last time. If you have the option to go, and are on the fence, do it. I will never forget that day in June 2012 for the rest of my life. Spent the day with some amazing fans, got a Sutter fist pump before it was a thing, watched Quick swear his ass off and did I mention drinks (and I think merchandise) were half off?
Great day to celebrate the magic that is this team. GKG!!!