If you will fast Saturday and Sunday, this is permissible. Singling out Saturday is not permissible.

I have the intention to fast all 9 days of dhil hijjah (and I don’t have to make up any day from ramadan or kafara) ..it is recommended for me to skip saturday and begin again with sunday?

Fasting | February 23, 2014 12:32 pm
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Is a person sinful for breaking the fast(Voluntary) intentionally,without any genuine reason? If yes,Is there any expiation for that?
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I am a resident in Bahrain and I am currently in SL, and they have announced today (16thOct) that Eid will be on 27th Oct..which means the fasting for arafah will be on 26th,which is the day of eid for the pilgrims..what should I do?