There isn't a stated limit but if its ridiculous they might say something (think 10 or more)
They don't have a limit for how many people. As long as it's not a huge party you are planning to do at Tarzana. Ive seen about a family of 7 go visit one individual. If there are kid's... They just ask you to keep them close to you. Like Brendon said: "they might not have enough space to accommodate you" some will have to stand, and not have a seat.
I dont think there is , but the offices where you talk with the workers for more information might not have enough space to accommodate all.
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