what's wrong with "zuo tian xing qi liu le"?
i can say "zuo tian xia yu le" or "zuo tian gan mao le" and so on. what's wrong with "xing qi liu le"?

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'zuo tian xing qi liu'(昨天星期六) that is enough
'le' is used together with verb,for example 'zuo tian ta zou le'(昨天他走了)

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le   is  no  use in here

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You can say "zuó tiān (shì) xīng qī liù " or "zuó tiān (shì) lǐ bài liù " ("shì" can be omitted)

saturday = xīng qī liù = lǐ bài liù 

I hope it helps. ^^