[Grammar] Your order for your office party Tuesday afternoon

[kadioguy]

(From a TOEIC test)

(Woman) Your order for your office party Tuesday afternoon should be ready on Tuesday morning.

(Man) Great, but I'd like to pick it up on Monday if that's OK. I'll be busy with clients on Tuesday morning.

[...]

[Source]
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Why isn't an "on" before "Tuesday afternoon"? Is it optional there?

 

[slevlife]

Why isn't an "on" before "Tuesday afternoon"? Is it optional there?

Correct. It's also optional in all the other places it appears.

However, beginner speakers should probably include it in all the places it appears and also add it before "Tuesday afternoon," since beginners won't have an intuition for whether omitting it creates confusion or sounds unnatural.