In this sentence, 'in' means 'after', so you have to use 'would come'. I'm sorry; in already decided events, you have to use 'present progressive'.
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tonyscottWhich tense should I use? "came" or "would come" "or other tenses?I would use "was coming up". But this might be better:
tonyscottShe has no time to sleep because she has to prepare for the Christmas party which is coming up in two days.I would do it as shown above.