Do Saturday vs. Do on Saturday?

[Minh]

Hi everybody,

My friend asked me, "What are you going to do Saturday?"
Is above question correct? Should it be asked like this: "What are you going to do on Saturday?"

If both are grammatically correct, could please tell me the different meaning between "do Saturday" and "do on Saturday"?

Many thanks,

Minh

[Alan]

Hi Minh,

Your sentence: "What are you going to do Saturday?" is fine. the 'on' is frequently dropped in conversation as in: I've got a dental appointment Tuesday.

Alan
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[Technology]

Yes Minh, as Alan said, your sentence is the grammatically correct one. The 'on' is often left out in conversation and this is accepted, but traditionally it is incorrect.