Hi Tom I will be thinking of all of you come September. = I will be thinking of all of you when September comes /arrives (or simply "in September") . It seems to be a reference to the fact that the heroine expects something specific to happen in September which will cause her to "think of all of you".
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Mr. TomCan I use it in everyday conversation?I'd say it's sometimes used in everyday conversation.
Mr. TomIs the use of come natural in the given sentence?... I will invite you to dinner come December.I'd say that would be possible, but only if the reason for the choice of December in particular is alrea