What a great experience to camp on the playa of the Alvord Desert! So unique and interesting, and the star-gazing is amazing!
As others have mentioned, be very careful about the weather. In my case, it rained in another part of the desert and because it is so flat, the water actually blew much closer to my camping location than I thought possible. I didn't get stuck in it, but it is something to consider.
I entered at Frog Spring and had no problem with a 4x4 and trailer made for off-road travel. Might be worth walking the short road first if you're in a sedan or have a regular travel trailer to make sure you're good to go. If it's not good, everyone told me that entering through Alvord Hot Springs is a little smoother option.
Fields, OR was a great place to stop for a milkshake and to get the latest on conditions out there. Planning to do it again sometime!