TOUR DAY UPDATE: it is now too late to buy tickets online, but you may pay at the bus door (cash/check/credit card). Call 213-915-8687 to reserve.
This is just the page to buy your ticket.
Check in is 11.30am at the Daily Dose Cafe in the Arts District of Downtown Los Angeles.
THIS PAGE has the canonical information on meeting location, check in times, parking suggestions, &c. . .