Hi Bluemoon. Is this your first time attending Falcon Ridge or just your first time volunteering? Either way, welcome. There is a special community within the larger community when you volunteer. Now let's see if I can help with some of your questions:
1) Just about anywhere you camp (weather conditions depending) you can park your car right next to your campsite. I put in that caveat because the festival is on a hillside that can get very slick when it rains and the further up the hill you go, the more treacherous it may be. As someone has already said, be sure to park SIDEWAYS and not up/down the hillside.
2) I'm not sure about the "dedicated dish-washing areas". I know that there are stations outside the portapotties that say do NOT wash dishes here. I think it's okay at your site as long as you are considerate of the fact that it is a working farm. There are tankers of water availabe for you to get water to haul to your site. I used to try to do the ecologically-minded thing and bring my own dishes & wash them but it was too big of a hassle so now I just use the dishes they provide in the volunteer food tent for the most part.
3) Volunteers are provided a HUGE!!!! breakfast. This is also the only meal that provides meat products. (Bacon, sausage) Get up early and fill up 'cause they don't provide lunch. Dinner is usually light fare - salads, soups, pastas, etc -- but there is plenty of it. Although lunch isn't provided, there is usually peanut butter & bread and fruit and maybe some leftovers around to snack on during the day. And there are "late night snacks" - fruit, pudding, pb&j, etc. They feed us well. There is even a "Chuck wagon" volunteer crew whose job it is to see that working volunteers get fed. Oh yeah...and there is ALWAYS water, tea or something cool to drink in the volunteer food tent so STAY HYDRATED! Also coffee & hot tea.
4) I'm trying to remember if there was food last year on Thurs night. I think they did have a light dinner for us but don't take my word for it. LOL I'm going to bring backup just in case.
5) At first I thought you meant "tickets" and I couldn't figure out what you meant. DUH!! I've gone to Falcon Ridge (off & on) since the early 90s & I've never gotten a tick from there. Bug spray for skeeters might be a good idea.
6) I gave up trying to color-coordinate my FR attire years ago. I think most others have, too. I never know the color of the shirt until I get there.
7) I've had friends who worked security. Apart from the volunteer T-shirt, the only thing I can think of that was any different from anyone else is that they are the folks with the walkie-talkies. No, no dress code. Be comfortable. One of the things I love most about Falcon Ridge is the diversity and that shines brightly in the different ways that people dress. A lot of folks even "customize" their volunteer tees. It's all good.

Yes, you can stay over Sunday night (but they stop feeding us....and the portapotties leave early Monday

) I'm going to be staying over. There's usually a pretty nice group of people who don't leave until Monday.
Gail, electricity (& outlets) are rare at FR so if you don't have a car charger, that may be a problem. But volunteers are usually at a bit of an advantage there as there is sometimes an outlet available where you are assigned that you may be able to use. (Ask your crew chief.) Also, sometimes you may be able to befriend a vendor who has power in their booth who will allow you to plug in for a little while. (They may be friendlier about it if you offer them a few dollars.) Another alternative is to ask someone who is staying off-site (at a motel or campsite w/ power) to take it and recharge it from there.
Hope this helps a bit. I can't believe that this time next week I'll be sitting at the mainstage, sad that there's only one day left.