One two freddys coming for you, three for better shut the door, 5 6 crucifix seven eight better stay awake!
I thought it could be a "nightmare" theme -- but that almost seems too tame and safe for the Los Angeles Haunted Hayride.

Last year they had some crazy "Echoes from the Rift" theme, with all of these wild explanations and descriptions of what would be happening ("gaping maw of terror" was one phrase I seem to remember). It was quite funny.
The Rise is already selling tickets. If you request a promo code, you can purchase tickets. Dates are Thursdays-Sundays in October. They have added 2 additional Southern California locations. This year it will be held at Descanso again as well as Santa Anita and San Diego Safari Park.
I saw that the San Diego location and the Santa Anita location had been added in -- in fact, I mentioned it here in this thread a few days ago -- but at that time (Tuesday), I totally did not see that tickets were already on sale!!

It looked as if the dates were not yet posted. I guess they were either there, hidden somewhere, and I didn't see them because I was in the wrong section of the site, or they just became available since Tuesday!
Have any of the parties sold out before the general public get a chance to buy tickets? And for a member of the general public, where is the best way to buy party tickets?
As BobearQSI mentioned, you can see when all of the party dates sold out last year (I have the "SOLD OUT as of.... " referenced in bold red, in both the Dates to Remember post and in the MHP FAQ post on page 1). I think you'll be fine, and you'll be able to get the tickets before they sell out. I think that you could just order them online -- that would probably be the fastest way -- or you can call the ticket phone number. Do you have a Disney Visa?
Can advance party tickets be purchased at the ticket booths? Just wondering in case they go on sale while we are there at the end of this month.
I'm pretty certain that you can buy MHP tickets in advance at the ticket booths, but I don't
think you can get them at a discounted rate at the ticket booths. I'm pretty sure that, if you are planning to use an AP discount, you have to order them online via the link that is set up for AP holders, or over the phone. I know that Disney Visa folks have to order the tickets over the phone in order to get the discount, but I don't know if they can get a discount if they buy the tickets from the booth with their Visa. My hunch is that tickets bought at the ticket booths cannot be discounted, but I could be wrong on that. It's not something that comes up a lot, strangely -- I guess most people either get the tickets online or over the phone in advance, OR they get them at the last minute from a ticket booth (the day of the event).