Conditioning hair once a week?

Im going to a wedding this weekend and want my hair to look good. Problem is it gets greasy easily so I only condition it about once a week, if that. Does anybody know, if I condition it tonight and leave it in for ten minutes, will there still be a noticeable difference on Saturday bearing in mind I will be washing it Friday morn and sat morn? I don't want to do it Friday night Because it'll make my hair heavy and limp on sat! Or will I be wasting my time?
Conditioning hair once a week?
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